The location of the apartment is ideal, 5 minutes away from Puerta del Sol. Situated within walking distance to main areas/attractions of Madrid. The street outside is very noisy, however the bedroom is very quiet and you will be able to sleep without any trouble.
The size is perfect for 2-4 people, its warm and cozy. Also, the space was well kept and clean. If you don't have too much luggage or bags, then the stairs won't be an issue (there are four flights of stairs!).
Marta was very nice, and the communication was great once we got to the apartment. We were able to leave our luggage prior to the check-in, which was awesome.