Ciao Margaret and welcome to our forum! Hope we can use this platform to build up a conversation, 2026 isn't too far down the road actually, it does take planning and careful consideration to make such a move. The fact you already have EU citizenship will make all the paperwork and bureaucracy much easier, although be prepared for things to always take longer than you think they will take. I'm talking of anything and everything!
Then you can be pleasantly surprised when they happen faster!
First, have you already been to Florence and Tuscany? If you have, do you already have any place or area in mind? I ask because Florence is expensive to live in, while towns nearby are used by a lot of commuters to come into work every day so not as cheap ad you'd think. There are a lot of connections in public transport to facilitate that in some areas but not in others. Considering you don't plan to drive, you most certainly need to put that high on the list as you select areas in which to focus your search.
Also, you say a "temporary" place - how temporary at first? Because places that might have everything included are rented as short term and cost more than places that are rented by the year but which more often than not do not include utilities or wi-fi. You can also consider that you start with a short term rental and then once you're hear look for something you love, considering you will be able to visit and see.
Ok, I think that's enough to get started. Look forward to hearing your thoughts up to now!