Overall, we had a great stay. Location is 15 - 20 minutes from all the sights, right next to the L3 metro line, and a bunch restaurants, cafes, etc. right next to you. Apartment was clean, lots of kitchen stuff, and simple but functional. Host is super nice.
It is cold during the winter months (we stayed Oct. to Jan.), but the host provided 2 space heaters.
The place is dark though. Practically no natural light gets in. Enjoyed our time, and Barcelona is a super fun city.