I was there last month ! 😀
Happy to help with questions.
My answers my not be apt for your situation... everything helps !
Biggest tip is...
Good footwear and travel light.
We stayed on a water front so our private taxi was able to drop us off right outside the front door of the apartment.
Private taxi from airport is €150 approx per boat .
Think it takes 5 .
Extra PP are £pp then.
We were 4 with just backpacks so the extra luggage...I didn't take notice of.
We bought a 48 hour vaperetto ticket which took us to all the islands over 2 days.
Venice is walkable...even for someone as unfit as me !
But you need the vaperetto to get to the islands .
It is €25 for 24 hours or €35 for 48 .
For an extra €10 it was worth having the extra morning.
Cheabeto app is the easiest way to navigate your times and stops.
If you are not use to city travel , tubes and changing lines and stuff ,, it might seem confusing.
But it really isn't !
They do all connect somehow !
And they are soo punctual 😅😅.
I don't want to influence your choices ..but happy to give my view on things !