Mercedes is a great host. Her apartment is very nice and tastefully decorated. She rents out 2 rooms with the 2 guests sharing a bathroom. My room had a single bed and a desk with a good desk lamp so that I could do some work from home. The room gives to a quiet side street and has a little balcony. I slept very well and I enjoyed my stay at Mercedes' place which is very conveniently located about an 8 minutes walk from the Atocha train station. I would definitely come back.