My husband and I are lovers of all

Try looking in Lucca - the centro storico is flat, and easily navigated for people with limited mobility, and Im sure you will be able to find suitable accommodation by looking on websites.  My parents stayed in a small hotel there with ground floor disabled accommodation. 

Thank you so much. Do your parents remember the name of that small hotel?Kathleen

I've seen this question or similar a few times, try a search "disabled travel italy" as I'm sure someone came up with a very good link or two. Saying that Lucca is a lovely place to visit

It was the San Martino in Lucca - best check that they havent changed the rooms though.