I stayed in this apartment for just over a month. Jose is a really nice guy and the room is ideal for anyone visiting Madrid. There is a metro station about 10 minutes away and a 24-hour supermarket with everything you could need food-wise next to it. if you're a keen walker, the city centre is also accessible within 30-45 minutes.
The room itself is exactly as described and the en suite bathroom is a real added bonus. There are two other rooms in the apartment. While I was there the other guests, who were living there long-term, were very quiet and respectful with no noise or inconvenience. A cleaner also comes every weekend to clean the communal areas of the apartment.
The only issue I encountered during my stay was a burst pipe in the kitchen, which Jose was on hand to fix temporarily within minutes. A plumber then came a couple of days later to fix the issue permanently.
I can't recommend this place enough for someone looking to visit Madrid and if I'm ever back in the city it's the place I'll stay in again.