This was my first time in Madrid and the flat is perfectly located from which to explore all directions. The bed is super comfortable and I had everything I needed. It can be slightly noisy at night but this is the trade off for being in the centre of the city even on a quiet street. The windows are solid and there are metal black out curtains that help with that as well.
The hosts responded very quickly and the building felt secure. The bedroom is separated from the living room by a sliding partition so for more than one guest it will be cosy, but the fold out couch looked very solid. I would definitely stay here again! Great value as well