We had a great stay at Marc's place located in the best neighborhood of the city. You have everything close by this is amazing ! The A/C worked perfectly and the windows keep you in a more or less quiet space (yes it's right next to the Rambla so you hear the party in the street on a daily basis - but I am very sensitive to noise and with my earplugs it was perfect !).
The place is very comfortable and has everything you need. The only thing is we thougt it was 2 rooms separated but there is actually no door or wall between the living room and the bedroom.
Overall a great experience !