The apartment was ok.. a few things that are VERY important to know;
There is no air conditioning in the bedrooms!!! Only in the living room and the corridor. When we asked the host to provide at least fans for each room they refused. Very disappointing and uncomfortable. Rooms are hot during the summer nights.
The check-out is early as 11am and they don't allow to leave the bags anywhere even though they have building storage room. We had to pay 50 euros to local storage for 2 hours they kept our bags. So if you have late flight - need to consider this.
Last thing is that is that the beds are 2 single that are close together and it's not very comfortable as a couple. The bedrooms are pretty small as well
A few good things are that the location is great, living room is big and have lots of natural light, view to Gaudi's building (from behind), dinning table is comfortable to work from, check-in is easy.
In a look back, if i knew all that before booking - I would not book this at summer time