Everything you find in the house is part of the Welcome Kit, and you are free to use it.
If you need anything else (extra toilet paper, water, soap etc.), here is the link with the closest supermarkets
By the way, tap water in Florence is drinkable and safe!
Here is a list of all the items you will find in the apartment that might come in handy.
Folding chairs
Ironing board
Iron
Drying rack / clothes rack
Boiler
Broom
Vacuum cleaner
Dustpan
Bucket (for mopping)
Mop
Step ladder
hairdryer
first aid kit