I was in Madrid for five days and I wanted a flat rather than a hotel room. Mayte's flat was just what I had in mind and this made for a really nice stay.
Checking in and out went smooth and the flat was spotless: clean and nicely furnished, just as described.
The metro is close by and it links to many areas of Madrid and also directly to the airport. Walking towards the city center is also an option, but takes about an hour.
I highly recommend the flat - will also book it myself next time I'll be in Madrid.