Melissa's place is great, in terms of everything - location is very central, with walking distance to Prado museum and the resr of the sightseeing points.Also a lot of bars/restarauns/shops nearby.
The place is clean and nice.
Also, Melissa is a great host, she let me check out later, which was super useful and helpful for me, as I had a late train in the evening ( to another city ) and didn't know what to do with the suitcase and bags.
Highly recommend it!