I stayed at the Quiet flat - Gran Via/Callao location for 2 months while studying in Madrid. I did not know anyone, and Nader went above and beyond to make me feel at home. He picked me up from the airport, and had croissants, jam, ham and wine waiting for me in the fridge! The apartment looks exactly like the pictures, and you cannot beat it's location. It is practically on top of a metro station, and within 5 minutes walk of 2 other metro lines. The flat is also surprisingly quiet, despite being in the heart of the city. Thank you Nader for being so available, communicative, flexible and kind. I hope to be back soon!