A genuinely lovely place to stay in Florence. Everyone mentions the stairs (and yes, they're good exercise), but the view over Santa Croce and the loft-feeling of the apartment is worth every step. Great location, great value.
As for the hosting, Federica was communicative and helpful throughout. We made a few mistakes getting to Florence (delaying our check-in and making her wait), but she was accomodating and made us feel very welcome.
No wi-fi, but this is arguably a positive in somewhere as trapped-in-time as Florence. There are guides on the bookshelf if you need them, but by ditching the phones you can really lose yourself for a few days.