This apartment is such a terrific, cozy place to explore Barcelona from. Marta & Artur were incredible hosts, ensuring we had city maps, transit maps and recommendations of terrific spots to eat and drink. They were extremely responsive and everything was as described on the site.
The apartment is perfect for one or two persons, but may be cramped for a larger group. The shower is very small, so if you are a larger person, this may be a bit challenging. Its not easy to bend down in the shower to grab shampoo bottles. However, the bed is extremely comfortable (the duvet provided the perfect amount of warmth for both my boyfriend and I!), the kitchen well equipped and the patio view is incredible. We had many breakfasts and cocktail hours on the patio, looking at Gaudi's Sagrada Familia. Like many places in Europe, the building's elevator is quite small and luggage will still need to be carried up some stairs (the elevator does not go to the level of this apartment). The apartment does contain a washer and its easy to hang your clothes to dry on the patio, especially if its a warm sunny day.
The hosts provided many small creature comforts in the apartment including plenty of soaps, towels, toilet tissues and kitchen basics (pots, pans, olive oils, salt, pepper, etc). Not all air B&B hosts ensure their apartments are so well stocked!
The apartment is near a major underground metro station, which makes it easy to explore the city (you can buy 2, 4 or 5 day passes that allow unlimited travel on the metro). It is extremely easy to hail a cab in this neighborhood, even for an early morning flight (which we did around 7am on a Sunday). There is a large grocery store a couple of blocks away and a small super mercat right next to the front door that is open late and has the basics (including wine, beer and cava). We found the city extremely easy to explore by foot as well as metro from this location. The location also felt very safe.
I highly recommend this airbnb location and hope to return one day soon!