Ruben's apartment was perfect for our stay (group of 4 people). It's a nice and cosy, really close to everything you need, and a small walk to Puertas del Sol. He always responded to us very quicky, gave us tips of what to see, where to eat, supermarkets, and everyting that you would need for the stay. The apartment was exactly as it was advertised, and the neighbourhood is very calm with minor noise from the outside. I really recommend this apartment if you're planning to stay in Madrid!