We just stayed in Rossella's place for three nights. It is a stone's throw from the railway station and from Florence's conference centre, so it is very handy if someone is traveling to Florence for work. The access to the apartment is very easy and Rossella provides excellent instructions with pictures and numbered keys. She met us at the apartment and explained everything we needed to know in detail. She also remained easy to reach throughout our stay. What I liked most about the apartment was the cleanliness: it was spotless! I imagined it would be a bit bigger based on the pictures, but that wasn't a problem. The kitchen had all the accessories we needed.
Overall it was a great stay. Grazie Rossella!