Martina's place is brilliant, especially for a couple. It looks exactly like the pictures on the site, cosy, cute and comfortable for a couple staying a few nights in Florence.
One of the best things about the apartment is the location. All the major attractions are walking distance, even the Santa Maria novella train station is walkable distance. You can easily come back to the apartment for a break before you head out again to your next sightseeing point.
There's also a bus stop in front of the house as well as a supermarket with a wide selection of produce very close to the apartment.
Finally Martina is a great host, she helped us out a lot with restaurant recommendations as well as other few bits here and there.
I'd highly recommend Martina's apartment.