We had a fantastic stay at Ana's apartment during our time in Madrid. The apartment is modern, clean and spacious, with a big living/kitchen room area and bedroom. There's also a lovely terrace to have coffee outside in the morning or a drink in the evening.
The apartment is perfectly situated in Madrid on Calle De Santa Isabel, 1 minute walk away from Anton Martin tube (gets you most places) and a 10 minute walk to Atocha (main train station). The area is full of bars and restaurants (Ana has great recommendations!) and the flat is opposite a market. You can also walk for 20 minutes to Malasanga and Salamanca which are cool areas too.
Look no where else for when you come to Madrid!