María’s apartment is ideal for a solo traveler in Madrid - it’s right in the center with easy access to many metro stops (including Sol) and walking distance from several attractions. It’s a great little space with nice amenities. However, I do think it would be tight for more than one person. Also, you have to take 50 stairs to get to the apartment (there is no lift) so please note this if you have accessibility issues. Overall I was happy with my stay.