This is a really great apartment just two blocks from La Ramblas. There are amazing plazas, food, and everything literally steps away from the front door (Try Viana's, it's so good!).
The alley/street you walk down to get to the place is a little sketchy, in that you will probably be offered weed/cocaine/etc about 3-5 times in two blocks. But that is also the case all the way down La Ramblas too. It's not dangerous, just annoying.
The apartment itself is super fantastic, clean, and really lovely to hang out in. One of the rooms is blackout dark if you like that in your hotels, and the other has a little window light. If you plan on having someone sleeping in the living room on the couch, don't. You will hear street noises until at least 5am every night.
It's a great spot because you can leave your luggage on the ground floor if you arrive early or stay late.
Getting into the apartment is a little more complicated than just using a set of keys. It's four steps if you are using the elevator:
1. Keypad code to get in the front door of the building.
2. NFC wireless entry to the lounge area.
3. Special code to get the elevator to your floor
4. NFC wireless entry to open the door to your floor when the elevator stops there.
after all this I give the place a 9/10, the only thing not perfect is the alley leading up to the building, just feels a little full of people selling drugs or trying to get you into their bar.