Apartment at back of building so you heard virtually nothing around you. Quiet walking-only street. I lived in Florence (and downtown) for two years, and this was one of the quieter locations I’ve ever stayed in when coming back (which is at least twice per year), or in that two years.
If you are staying downtown - I also highly recommend this particular area of the city. It’s higher end part of town near Via Tornabuoni (Rodeo Drive of Florence ;). The Westin rooftop (some of best views in Florence), is also quick walk from the apartment. You can ultimately get to every major monument, the Arno, and the Train Station in 10 min walk.
For those concerned about being on 4th floor, there is an elevator (which is highly rare in this city) so stairs can be avoided where/ when desired.
A++ service from Monika, our host, as well :)