Staying in Elsa's place was fantastic. It was 5 of us and place is very spacious. Apartment was very clean and had everything in a kitchen. It even had some spices which we used for cooking breakfast. Building equipped with an elevator which really helped us with getting our luggage to a flat. I would say that I'll stay there again. Location is perfect. Close to metro stations, hop-on/hop-off buses and train. And don't forget about Sagrada Familia (only 2 blocks away)
P.S. Friendly tip for fellow travelers. If you are arriving to an airport and don't want to use a taxi (which is kind of expensive) do not use metro also (too many connections which is unconvenient with a big baggage). Use a train to station El Clot Arago. It's cheap, fast and only 6 blocks from Elsa's apartment. There is FREE shuttle bus in airport between T1 and T2 terminals which runs every 5 minutes.