The place to stay if you want to be near the main attractions in Madrid! Puerta del sol was only a few minutes' walk away. The furthest we had to walk was for the Museo Reina Sofia, approximately 15 minutes walking.
All the appliances/amenities (ac, fridge, shower) worked very well and the bed was comfortable. Just be aware you will have to walk up about 5 flights of stairs (apt is on the fourth floor). The neighborhood is safe and was always bustling with people. However, there is no need to worry about noise as we did not hear anything through the walls at night.
A recommended stay!