Location, location, location. Marta's place is ideally located for walking to all the significant places in Madrid--Museums, parks, plazas, and the Lope de Vega house. Great tapas places and restaurants nearby, and easy access to the Metro, the train station and airport. The snug flat is well appointed and could sleep four (we were three) and is easily accessible with stairs to the third floor. It has no windows to the street so even though you're in the heart of things, it's very quiet. Marta gave us good tips for getting to her place from the airport (really easy), and even though she couldn't be there to meet us, her sister welcomed us and gave us all the necessary details. We had a great stay.