For the price it is an overall good apartment in a great location. The communication with Francesc and Alex for check-in was very fast and reliable. We were even allowed to arrive a little earlier for chek-in and leave our bags in the apartment a little longer after check-out until we headed to the airport. So that was really nice.
The rooms were okay. Some rooms are very small, especially the kitchen and bathroom, and in the pictures the whole apartment looks much brighter than in reality. Many of the windows go out into a narrow alley, so that practically no light comes into the rooms and you have to use the ceiling light all the time. If you spend a long time inside, this can feel a bit cramped - but if you are out and about in Barcelona during the day anyway, this should probably not bother you as much.
Cooking was possible. There was no salt or oil, but other essentials were available. However, cooking for 5 people took us a very long time, because many things were only available once (only one cutting board, one sharp knife etc).
So for the price the apartment is perfectly fine, however, it is rather something for people who want to do a lot during the day and maybe eat outside once or twice instead of spending too much time in the apartment.