A good appartment for a group of 6-8 in a perfect location (5-10 min walk to Sol, Prado, Atoha station, direrctly at a metro station). There are uncounted bars, restaurants and shops around.
The appartment was clean and tidy. It isn't in a perfect state, but good enough to spend a few days. The sleeping rooms are pretty small, but there are plenty of them, so you can feel comfortable, when not with family members. It can be sometimes noisy from neighbours, particularly on the weekends (well, Spain :). Wifi and cable TV available.
The host Sergio was super-friendly to us, and ready to help at any time. Up to the point that he was supporing our attempts to buy Real Madrid game tickets.