The room is very clean, as is the whole appartment. The hosts were very friendly and quick with communication and everyone was quiet in the house - except for the dog :) The appartment is 17mn away from the Sagrada, and 7mn away from the metro.
I do think the room is a bit small and so are the bunk beds - it is better value in summer when you can enjoy the terrace and pool, but this is Barcelona, it's an expensive city !