Excellent choice. The place really is very well located, just walking distance from everything you want and need to see in Firenze. Ten-fifteen minutes walk from the train station, right on the corner of Ponte Vecchio, just next to the Arno river and in between the historic centre and Oltrarno, well worth visiting as well and with great restaurants. You do have some steps to climb at the main entrance of the building but it is very bearable. After that, you have a lift that will take you to the third floor. Once inside, you will find an apartment you can only dream of in any major city in Europe. It is perfect for up to six people on a short stay, better for 3-4 on a longer stay. I wish I had an apartment like this when I was living in Europe.
It is a tad noisy on the street in the morning because of the activity in preparation for the day in the street, but there is excellent double window insulation and you barely notice it when inside. The apartment has three spacious bedrooms, two wide bathrooms, a fully equipped kitchen and is extremely well organised. We found some basic things to get started with in the kitchen (salt, sugar, oil) and we just had to go get the rest at a supermarket (that is a bit far, you have a couple of Carrefour close to the Duomo, and a couple of copycats in the same area, ten minutes walk). Everything worked perfectly in the house. The cooker, the fridge, the dishwasher, the washing machine and the dryer. The beds were extremely comfortable and gave us a quality rest, well needed after all the walking. Special mention to Manfredi who was extremely dedicated and quick in responding to our questions. I cannot stand the synthetic pillows and asked for one which would be of other fabric. Said and done! Also, any and all recommendations by Manfredi as far as eating places and Gelaterias were spot on.
In short, go to this apartment if you want to make your stay in Firenze a total success. Grazie Manfredi, e in boca lupo.