hey hey susan
life throws us lemons and now you make lemonicello. don't stress, it will all work out. look at whats available even if not in places you want to be in or length of time. your arrival time is not the greatest, so i would look for a hotel in rome with front desk 24/7. you may not arrive to hotel till midnight after getting off plane, customs/passport and i would take taxi to town. check out markets at termini station and testaccio, eatingeurope.com for a food tour. i picked budget places, you may have jet lag so i would just walk around, nothing planned, we walk near pantheon and a wine shop let us taste, i loved the lemoncello, campo de fiori a piazza with anything and everything to sell, roam thru the salami shops, bakeries, bring a goody home for a snack or breakfast, "free" entertainment, bring coins, carry small bills in euros, have lunch or dinner down an alley not at touristy area,
booking.com hotel filippo, little queen navona, inn rome rooms&suites, affreschi su roma luxury B&B (has breakfast) look at them call or email if you can get more of a discount. love this area to stay, walk to a lot of places, piazza navona, pantheon, campo de fiori, trestavere. don't know if too late to reserve attractions, you can check out mybesttour.com (golf cart tours of different places to see)
you can check airbnb.com for tuscany and apartments or houses with rooms.
also booking.com if you know what place you want to stay. another place is lucca. look for parking (fee or free), be careful driving because of ZTL's DO NOT enter city centers, get an IDP from AAA, $20 and 2 passport photos for every driver, coincides with your drivers license.
apartmentslucca.com it's a walled city, stay within walls, bikes to ride, luccatours.com for intro to city, take the train to pisa (if you plan to climb to top make reservations opapisa.it. walk the piazza, enjoy the evenings, sit have lunch or dinner, glass of vino, people watch. take the train to viareggio, walk the boardwalk of the beach. come&seeitaly.com has some tours to different areas, barga and gargafana, pinocchio's hometown is collodi not too far away. has a park, garzoni gardens and the butterfly house, wine tasting at fattoriaaldotto.it
cucina-italiana.com with chef paolo monti. he has half day cooking classes, also has accomodations, don't know if you have to take a class to stay
extravirginlucca.com is a cooking school in lucca
in panzano in chianti stop by the famous butcher, dario cecchini, a showman with his artsy style of cutting meat, likes rock and roll music, has a restaurant for lunch.
incinqueterre.com has places to stay and things to do, maybe take a class how to make pesto. it will be crowded, ride trains early morning or late afternoon. enjoy and smile with just being there.
venice: you can check albergo marin over grand canal bridge, rent 2 double rooms. and down alley way. away from crowds and noise but close to boats, walking around. we stayed at hotel near and loved area, just get lost to zig and zag through alley ways, maybe do a cichetti tour (bar crawl and appetizers) schezzini.it or streaty.com for a food tour, a gondola ride
you'll have a fabulous time, i know you can do it. have fun. hope this helps you get started, let us know how you did
aloha