The apartment is very nice, new and fully furnished, and it is exactly as advertised. The AC was perfect, and we had wi-fi, tv, washing machine... It looks good, too! It has two double beds and a sofa bed (all of them comfortable), so I think it's good for up to five guests.
It is well located, as in a few minutes of walking you can reach the Royal Palace, Plaza Mayor and the Puerta del Sol. At night it's a quiet place and you won't be annoyed by noises outside.
The host, Ana, is very friendly, helping and communication was very easy(she speaks italian wonderfully, too). She also helped us with a very flexible check-out time.
Highly recommended!