Where to donate used goods
Donate to Caritas in yellow bins
H&M clothes recycling program — drop off at store, including damaged clothing
Charity shops for Progetto Arcobaleno — Via Leone 28r and Via Palazzuolo 9/r
Florence is — more of less — bike friendly. In town, things can get a bit bumpy and traffic a bit close for comfort, but there are a growing number of bike lanes, especially up and down the river. In the immediate city, you can get most places by bike within 15 minutes, whereas most other means are iffy. Even driving is a pain because of limited traffic areas and parking. Your best bet for a second-hand bike is someone selling theirs because leaving town.
Bike theft is a big problem in Florence. If you can’t keep the bike off the street, new, nice bike may well be a very temporary possession. Make sure your bike lock costs about as much as the bike itself!