The check-in process was seamless. The host even waited for me in spite of my train to Madrid arriving late. The apartment itself is extremely close (ten minute walk to Plaza Mayor) to many of the city's main attractions. The kitchen is also well equipped for your needs, and the decorations inside are very nicely done. Echoing what others have stated, the only small comment I have is that the stairs getting up to the apartment would likely be very difficult for someone who is older/elderly. Otherwise, you won't regret your stay here!