Visit Trastevere in the evening - it’s a lovely place to wander in the evening, lots of lovely restaurants and bars.
If you’re on a budget, go to Fresno e Frizioni in Trastevere for aperetivo ,for about €10 you get a drink which also includes unlimited visits to a buffet bar - it was mostly cheeses, hummus, salads, breads etc, but was delicious. We were planning to go for a meal after, but we were full up!
A great place for wine is Cul De Sac, just off the Piazza Nirvona. It’s not much to look at (formica tables!) , but is always busy with locals and tourists. At very busy times, you must get a ticket before joining a queue to get in. They have a huge range of wines , starting from around €12 a bottle, up to €2000! They do fab meat and cheese platters, although the rest of the food is very average.
Lots of things are free in Rome, just wander, popping in to churches, shops etc as you go. My favourite place was the Pantheon.
If you have time, walk up through the rose gardens to the Piazza of the Knights of Malta, and peer through the keyhole in the gate there. It took my breath away!