I have seen many Airbnbs so far in Madrid since I visit the city on regular basis. Alvaro S Place was by far the best. The completely renovated building is very old from outside but modern from inn side. Alvaro has implement a modern check in and information system via an app. The apartment is spacious with two complete bathrooms and bedrooms. The sourronding area is full of excellent bars and restaurants, rather up scale.
Will definitely stay at Alvaro S place again next time I come to Madrid!