Positive: Great location, close to the Diagonal Station, Casa Mila, Paseo de Gracia, many shops & restaurants.
Negative: Check in representative arrived 1 hour late. HVAC was not working but got fixed after the technician came. There is a lot of noise during after hours (11:00 PM - 4:00 AM) coming either from the outside or from the common hallways. You can hear every conversation from people walking in the hallway.
Summary: If you are looking for a prime location and can tolerate noise during sleep time, this is a great place.