The good:
The pictures are accurate but the appartment is more worn now than when the pictures were taken. But it is still very nice.
Beds and sheets are good.
Good space
Nice with cleaning.
A lot of appliances and comforts.
You can reach most of Barcelona on foot from there.
There is a store literally across the street.
Powerful airconditioning
Good communication with owner.
The bad:
Too few plates and other kitchen appliances. The stove & oven is very modern but is limited by lack of plates & cutlery.
You hear everything your flatmates & neighbours do. I do not know to what extent this is the case in all of Spain. Probably its the case in most apartments.
The area/neighbourhood is a party area. Lots of tourist traps & noise. Up to you if you like this or not.
This apartment is not for you if you want a quiet and clean neighbourhood. If you need silence when sleeping I suggest earplugs or noise cancelling headphones or finding a luxury hotel.
Summary
All in all we are satisfied, pleasant apartment with good social area and air conditioning. :)