I recently stayed at Domingo and Marina's place and I had a great time there.
The apartment is tiny but it has everything you need for a weekend or more.
The major highlight of this place is its location. It is situated in the heart of Madrid, just steps away from some of the city's best attractions, restaurants, and bars. I was able to walk to most of the places I wanted to visit, which was incredibly convenient and saved me a lot of time and money on transportation.
Domingo and Marina are also fantastic hosts. They were very responsive and helpful throughout my stay, sending recommendations for things to see and do in the area and checking if everything was fine.
I highly recommend this apartment to anyone planning a trip to Madrid.