Tipping drivers & tour guide
I searched this sub, but most of the answers about tipping are (a) specific to dining (which I'm clear about) or (b) 1-4 years old.
We will be in Rome, Florence, and Venice for about a week before a cruise, and have booked (via travel agent) multiple drivers & tours. Should we tip either driver or tour guide, and if so, what's a reasonable amount? Is 5€ too much or too little? Most of our tours are half days, but drivers might be just someone who walks us from Florence train to our hotel.
(I have some euros left over from a prior trip, but mostly 20€, so I'd like to make sure I have small enough denominations before we leave.)
Thanks!