I would give more than 5-stars to Isabel's place! Firstly, Isabel's hospitality is amazing and she was so easy to get along with. Communication with her was never an issue. She allowed me to check-in earlier upon my arrival to Madrid. You couldn't ask for a better location in Madrid. The apartment is 2-3 mins walk from the Anton Martin metro stop or about 10-15 minutes walk from Madrid-Puerta de Atocha train station. Easily walkable to Royal Palace (~20 minutes) and Museo Nacional del Prado (~20 minutes). Grocery store nearby with lots of places for food and drinks. The bedroom was spacious with a living area with a desk and sofa. Bathroom and toilet were very clean. I had a few nice chats with Isabel over coffee that she made me. Wireless internet was strong. Already mentioned, the apartment is on the third floor in a building without elevator. Because the area is so central, the streets can get a little noisy over the weekend but nothing major. Would highly recommend and will return when I'm back in Madrid!