Great central apartment, ideally for couples, but we managed with 3rd adult daughter for 3 nights. Very clean and comfortable. N.B It's on the 4th floor and there's no lift. This was not a problem for us, but be warned if not fit.
However the area is great for small shops, local bakers (for breakfast) and a 24hr supermarket. Metro 5 mins away and Plaza de Sol a 15 min stroll where all of the activity happens at night. Apartment peaceful at night, this is where the 4th floor is an advantage! Would recommend for short stay for those wanting a flavour of Madrid.