The apartment has a great location. Close to the center and also close to the Atocha train station, which is good when you want to go the wonderful Toledo. ( only 27 min) . The nearby Anton Martin stop of the metro enables you to go in 22min to the northern railway station Chamartin, where you have high speed trains to the equally nice medieval city of Segovia ( also below 30 min). Atocha train station is also the final stop of the 24 h non stop Shuttle bus, which brings you in less than 30 min for 5 Euros to the airport.
My apartment was the one not pointing at the street so very quiet. The only disadvantage is the very thin wall to the neighbor Apartment, which can make it loud when your neigbours come back during the night or get up early. The flat itself is quite big, the kitchen is well equipped( microwave , juicer , oven , fridge , freezer and also tea, coffee sugar) the furniture is simple, but given the price it is a very fair deal.