A nice modern apartment that is close to the subway and also to a 24/7 Carrefour supermarket. The host has a nice PDF prepared full of tips with what to do in Madrid which was very helpful.
However there were some communication issues and we were also unhappy because the listing did not have a fully accurate description of the place (it had only 1 and a half bathrooms, not 2 as advertised - for 5 people on a tight schedule that can be an issue).