The pros:
This place looks exactly as it did in the pictures with the exception that it had a balcony (which is a plus!) that faces a nice busy street filled with restaurants, cafes and small shops. The apartment is very clean, has nespresso (4pods), washer, hair dryer, and enough items for a short stay. They replenish after 8 days. AC works fine. Didn't use heater because the place is warm enough. The building feels safe because it has a coded entrance with camera. Small elevator but fits 2 people and 4 bags easily. There are double locks on the door and you enter the apartment with a card like a hotel. There is a safe in the closet. There is noise that takes place around 3-5am since it is next to Las Ramblas but the apartment is well insulated so you can only hear it faintly. If you are a light sleeper it might bother you but to us it wasn't bad at all.
The location is in the middle of all the action, right on Las Ramblas within the Gothic Quarter. 15 minutes walking distance from El Born and from Barceloneta Beach. 20 minutes walking distance from Placa Catalunya or Arco de Triunfo. Las Ramblas is right outside the building door although facing a big alley. There is a Starbucks nearby and many local Cafes with hot chocolate, churros and many pastries. Chocolate store near by also. Many small restaurants with great tapas, plenty to choose from. We like to look at the menus outside their doors to decide.
There are 2 metro stops very close and you can use the metro to get to any attractions. We used it for La Sagrada Familia, Casa Milo and Casa Batllo in Eixample Neighborhood. We also used it to get to Parc Guell and walked about 18 minutes to the park from the Metro stop. When we were there, all the Taxis were on strike and we witnessed a march of like 2,000 drivers but it was a peaceful protest against Uber. As a result we took an Uber from the airport but they pick you up in the parking garage at the airport. They can't pick you up at arrivals but the garage was very close and connected to the airport. It cost 32€ to get to the center of the city. I wouldn't recommend bus or metro unless you packed light. We also took an uber back to the airport. Both uber drivers were very kind. Im glad we took uber vs the taxis. Taxis might charge you more for bags.
Cons:
Im not sure if the description mentions this but the check in office is about 2 blocks away from the apartment building. It's not a big deal but we were hesitant to cross Las Ramblas with 4 bags. Nonetheless, we made it safe but it was uncomfortable as first time visitors. They didn't allow us to drop the bags off at the apartment before check in. You have to report to the office first and sign documents. However if you are too early they allow you to leave your bags with them until your apartment is ready and they are flexible with early check in but we were on time. They are nice.
The bed as seen on the pictures is double twin beds. We were aware that the beds can separate easily but that wasn't a big deal, we would just meet in the middle lol. The couch pullout bed is a good alternative if you care about that but we don't know how comfortable it was.
Please note that Las Ramblas while safe from violence, it is notorious for theifs/pick pockets because it attracts many tourists. We had an incident with a thief the very first day we arrived near the apartment. A lady walked into the restaurant we were at and she began to look around and snatched a purse from a young girl's chair who was distracted talking to her 3 friends as they ate. My wife yelled out to warn the girl and the thief stepped up to my wife as she threw the purse back at the girl and threatened to call her sister and mother to assault my wife. I stepped in the middle and told her to leave as she hurled insults and threw left-over food at me from a nearby table and the restaurant employees stood by watching and did nothing at all, Didn't even call the police or ask her to leave or to calm down. It appeared to us as they were in on it or were afraid. There was also a suspicious homeless man drinking a beer at the entrance who appeared to be in on the whole incident and probably tipped off the thief. This is not the airbnb hosts fault but it is important to mention due to the location where this apartment is at. If you don't care about justice for others and mind your own business and are careful with your belongings then you have nothing to worry about. But please be aware of all your surroundings and keep any money on your body. Keep an eye on your bags at all times. Careful with your phones. Always have one person on watch while the other takes pictures or videos. But enjoy yourself and don't worry to much. Keep a balance. In our case we weren't victims because we were prepared but by being good samaritans to careless young girls we attracted heat. I wouldn't stay in this area again because of the location and this incident although theft can happen anywhere but this incident was more likely to happen in this area because of the crowds. Other than that, the area does have alot of pros.