We enjoyed our 4 nights stay in Sergio's flat. Sergio and his wife were really attentive to our needs. The flat was clean and comfortable. We've been offered towels and soap, a bottle of water and some bananas. The flat is well equipped (free WIFI is a plus) and the glow in the dark walls in the 1st bedroom are really cool ! On arrival, Sergio's wife advised us on what to see etc. The nearest subway station is less that 5 mn away by foot and it's a 10 mn walk to the Sagrada Familia. The only down-side is that the neighborhood is quite noisy even at night but I guess this is part of the deal in Barcelona (could be easily fixed with new windows)!