We had a great stay in Florence in Apartment Lyli.
The apartment is in a great location, right at the end of the Ponte Vecchio, and in very close proximity to all the big attractions.
We used the kitchen several times and found it well equipped, the only thing lacking was a kettle.
We were not bothered at all by street noise. The biggest issue was the heat. The temperature was very high (38 degrees!) and with no air conditioning and just a fan we felt this at night. If you are particularly sensitive to heat you may struggle in the summer here.
Saying that we felt very well looked after and really enjoyed our stay.