Helen & Martin's place was perfect for three days in Madrid! Everything was easily walkable, including the metro, and we were close to the action in Plaza Mayor. Little touches such as recommendations for restaurants and shopping were available in the apartment, and our hosts even left a bottle of wine to welcome us (which we didn't have time to drink because we were so busy enjoying our time in the city!). Check in was extremely easy, and Helen was wonderful to communicate with and checked to make sure everything was ok once we arrived. In spite of being in a busy part of town, we were able to get plenty of sleep at night because of the window shades that also blocked the sound. Highly recommend!