We very much enjoyed our stay in Maria's gorgeous apartment! This place is by far the most beautifully decorated apartment we have ever stayed in. It's a bit rock star, a bit feminine, a bit whimsical, a bit baroque - and it was all very clean and in good condition on arrival. It is in a great neighborhood, removed from the busiest tourist areas but within walking distance of them. There are loads of restaurants, bars, and cool shops in the area. It was so entertaining just walking around the neighborhood!
It also has AC, which in a Madrid summer is such a wonderful thing.
Maria was easily reached for questions during our stay - a very kind host! I highly recommend a stay in this beautiful place!
One last thought: another reviewer mentioned that having little kids in this place might be a bad idea. I can see their point. There's lots of white everywhere and lots of lovely things at kid height. Something to think about for the parents out there.