I don't know anything about this hotel, never heard of it, but it's not a walkable distance to the old city center. Well, you
could walk it but would probably take 30-40 minutes - maybe faster depending on your pace. See the link I placed into the address in your posting above. The hotel is near the Alonso Cano metro station which is several blocks west of the Paseo de la Castellana's Plaza Doctor Marañon. You could always take the
metro or a taxi to the sights you're likely to want to see.
The NH Hotel chain is usually pretty trustworthy. Seems they're buying up many smaller, independent hotels around Spain to further their reach.
Good luck! Saludos, MadridMan
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