This place is all about location. It's the most perfect area to walk everywhere. Personally, Eixample and Gracia are my most favorite neighborhoods (I travel to Barcelona quite often), and this apartment is in the most convenient part of Eixample. You don't need to use public transport at all.
The purpose of the building is tourist accommodation (as is becoming the norm in Barcelona due to recent regulation). During my stay, all the other guests were nice and quiet and there was no noise from the other apartments at night.
The apartment is in good condition, there are large windows and lots of light. I stayed for two weeks and the place was cleaned three times during my stay. It was nice to come back in the evening and find fresh sheets and towels. The cleaning ladies were really nice.
The kitchen has all the basics you may need if you wanted to cook some simple meals but Barcelona is all about eating out so you probably won't :)
There's a big hairdryer in the bathroom, clean towels and basic toiletries which I didn't use but you might find them helpful if you don't bring your own shampoo and shower gel.
There are supermarkets, fruit shops, bars and restaurants nearby so you can get everything you may need in a matter of minutes.
Donald who checked me in was very nice and polite. I didn't need anything during my stay but I'm sure he would help if I needed assistance.
Overall, it was a nice stay and I would choose this apartment again. It's a little pricey considering the size of the studio but it's high season in Barcelona so it doesn't come as a surprise :)