My wife and I stayed 4 nights at Nico's flat. The flat is very clean and just as pictured. The flat is a 20 minute bus ride from the train station and a 10 minute ride from the city center. We had no issues navigating the bus system and Nico's place is only a 5 minute walk from the bus stop.
Nico gave us a shelf to use in the fridge and full use of the kitchen as well as pots, pans, utensils, etc. There is also a huge grocery store about 15 minutes away walking.
Because we stayed 4 nights we were given a free half-day walking tour of Florence from Nico. He took us to some great spots around the city including a really good ice cream shop slightly off the beaten path. We also learned some very interesting facts about the city's history. The only thing that we found a bit uncomfortable was that he seemed nervous around us. We don't think we are too intimidating, it may have simply been that English is not his first language, though he does speak it well. He was still very nice and his dog Spina is super friendly. Nico even offered to drive us to the train station on the day that we left Florence.
We would recommend Nico's place if you are on a budget and staying in Florence.