My partner and I spent three nights here for a city break in Barcelona. The B&B is hidden away on the principal floor of a multi-purpose building, so it feels quite private inside. The room itself was lovely and clean and the bed was the comfiest I've ever slept in! Breakfast was lovely, great continental selection and we were offered coffee / tea upon arrival to the breakfast area, which was a nice touch. Staff were really friendly and the room was well serviced every day with clean towels if we wanted. It's right in the heart of it all as well, around a half an hour walk to main tourist spots, and even if you're not a walker, there's a metro stop only a couple of minutes away.
The only "negative" feedback I have is the fact that one of the tiles on the floor of the room was broken - but this did not at all impact the quality of our stay, just popping it in here in case it's something you'd like to get fixed!
I can see a couple of people have mentioned the sound of the metro running underneath the B&B, it is noticeable but it stops at around midnight, and even so, it didn't impact our nights' sleep at all, so hardly worth mentioning.
Overall we had a lovely stay and would definitely return to this B&B!