In April we were staying in current flat with 2 girls and 1guy. The flat was absolutely comfortable for four of us. Very light,clean and cozy. In the kitchen there is everything that you need to prepare breakfast and lunch. There are also iron (girls will understand me how sometimes it can be very necessary) and air heater,in case you are cold.
The flat has very good location, near Casa Mila, so going home you can one more time enjoy Gaudi's masterpieces.
Marta was very nice to give advices for our Barcelona trip,and in general she is very good person to talk.