GoMadrid, good suggestions.

Could you recommend walking alone to these two hotels at night after an evening around Plaza Mayor/Puerta del Sol? That's an important question, I think. But you're right in that these two aren't far to Puerta del Sol. Any further east, say the Paseo del Prado, I consider being on the eastern edge of "Old Madrid" so returning there from the center (or western edge) of "Old Madrid" might be a considerable walk alone at night.

Saludos, MadridMan