Location: very central and close to the main train station. Got to most of the attractions by foot from the apartment. Lots of cafes, bars and restaurants in the area as well as markets.
Apartment: small and cosy and has all the necessities and niceties including air cond, washing machine, stove and wifi. Has a double bed in the bedroom (made up of two single mattresses) and a double sofa in the living room. We slept the first night in the bedroom and the second night on the sofa. Note for those who are light sleepers, the two bars downstairs open until quite late (2am) and the sofa may be a better option. This however was during summer holiday, may not be so rowdy the rest of the time. Having said that the sofa was equally comfortable and having the option was good.
Host: though we didn't get to meet our Niccolo, communication with him was easy and fast. His friend Juan Diego met us at the train station and led the way. He also left a welcome gift for us which is much appreciated. Great guy.
Recommendation: good place to base yourself from for a trip to Florence. Has everything you could need.