Overall great and affordable place to stay in the center of Madrid.
The location is great (walking distance to the city center), the room is spacious and also has a desk (in case you need to work like I did).
The WiFi was generally good, although it was slightly slow at one time.
Nelly is a wonderful host, providing tips about the city and always responding promptly to requests.
The apartment is shared with the host and there are 2 other rooms.
Cleanness was pretty good, besides some minor spots in the kitchen and room desk.
I would overall recommend this place to fellow travellers!