We booked a room for two people at a great price and ended up with a lovely, spacious two bedroom apartment that could have slept five easily. There are two apartments on each floor, we were lucky to have one that didn't face the main road so it was lovely and peaceful. The balcony was an added bonus.. There is no reception as such, so you have to wait 10 min after ringing a buzzer at the front door for somone to book you in, but that was not a problem. You simply had to leave the keys in a post box at the front door on checking out. The metro was very close, we used Encants station, and it took about 25 min from leaving the apartment to arriving on the street at Plaza Catalunya. The apartment was cleaned every day (weekends included). I guess the only down sides were no English TV channels and no functioning WiFi.
