My wife's least favorite accomodations in our world travels to date (including places with non-potable water) were in Italy. It may be that her standards are getting higher as we age.
She didn't like a hostel in Verona that had almost no water pressure in the communal bathrooms. You had to scoop water off the wall and splash it on yourself.
She also didn't like our hotel in Florence that had a shower head over the toilet with a pull around shower curtain. She was so obsessed with keeping it clean and dry that all our towels were soaking wet before I ever came close to showering.
If it matters a lot to you, pay close attention to how the hotel is described in the travel guides. If it says "Tiny bathroom", it will be really tiny. A normal European bathroom is tiny by our standards.