The host (Marta) was nice and helpful. Smooth check in, showed us everything in the place and gave us good recommendations for local amenities. The flat is very nice inside, though rather small, and extremely well equipped - it's got all you'd ever need. It is, however, quite dark and not very well ventilated - a good bet is to keep the windows open (which is fine as there are bars). The building is nice enough, but while it is VERY quiet at night, in the mornings the sound carries quite a lot, so not great for sleeping in too long. The location and area is brilliant - very genuine, local, great vibe, lots of bars, restaurants, little shops - fantastic. Plus a stones throw from everywhere, particularly Retiro, the main museums and the main train station. I'd recommend if you mainly use the flat to sleep. If you want to spend a lot of time inside, there probably are better places.