I have just returned after a four week stay in this apartment and can only echo what others have already said. The apartment is just fantastic especially for longer stays - spotlessly clean, comfortable, lots of light, quiet at night, well equipped, good connections by bus and metro. I didn't get to meet Andreas and Britte in person but their communication by WhatsApp/email was excellent. An issue arose in my final week which they immediately resolved in a very kind and considerate way. It is worth exploring the Prosperidad neighbourhood which is about a 10 minute walk from the apartment. It has good cafes, bakery, bookshops and a branch of Chocolateria San Gines without the queues of central Madrid. Highly recommended.