My girlfriend and I stayed in Madrid for 11 days and it was an absolute delight having Maria as a host. She is such a wonderful, kind and welcoming person that we became sad when it was time to leave. She made the whole trip much more memorable!
As for the appartment, it was pretty much what you can expect from the pictures. Nothing too fancy, but hey, not everything has to be, right? It has everything you would need. We didn't find a lot to do in the neighbood, but it is like a 2 min walk from a Metro station that takes you right to the city centre.
There's also a grocery store in the same building for quick refills and everyday stuff.
Definitely recommend, if you don't have too high of a budget. Well worth its price.