Location is awesome. Walking distance, 5-20 minutes, from many attractions: Sagrada Familia, Las Ramblas, Guell House, Gothic Quarter, La Boqueria, Picasso Museum. Many wonderful restaurants, grocery stores, bakeries, on the block or very close. The apartment felt very secure and safe.
The host was very prompt and quick to respond to all of our needs.
The reason for not giving 5 stars: the beds. They were rock-hard. If you like an EXTREMELY firm bed, then this is your place. But all of the adults in our group had aching backs after several nights sleep. We stayed in other locations in Spain on this trip, and none of the beds were even close to this hard. It is the only reason I would not chose to stay at this location again.
Also, the washer was very difficult to use and the handle was broken, so we had to take a tool to try to pry it open. We made the host aware during our visit, so hopefully it will be fixed. Don't expect to do much laundry though, because it is a tiny washer. We would not have knocked off a star for this problem, as our host tried her best to show us how to make it work.