We've stayed in Madrid many times, and this was certainly one of favorite apartments. The place is a beautiful old high ceilinged apartment, it was super clean, and Nelson was a sweetheart - he had to wait as we were a little late getting in.
The location is perfect for walking to Centro, 2 blocks from shopping on Gran Via, and 5 minutes to Malasana...one of our favorite neighborhoods.
If you're looking for a quiet part of the city, this isn't it. If you're looking for a vibrant, fun
urban neighborhood in the thick of things, you can't beat it. We would definitely stay here again.