Teresa,
Today in Rome it was 74 degrees and beautiful. Last week we were down into the mid 50's. I was in St. Peter's today for the Wednesday Papal Audience at 10:30 Am and there was about 25-30,000 folks... We've all noticed a huge upswing in the number of people on the streets and in the tourist locations. We just finished three consecutive weeks of friends visiting and all had great weather and a great time.
Looking back, I'd rather come in April, or perhaps even better May, as everything starts to bloom... and it's just NOT THAT HOT YET! June and July may be peak season but we do not have air conditioning (as most Romans DO NOT) so I enjoy this time of year best!
The currency is easy to use. Get it at an ATM! Everything now costs a little more than 1 1/2 times the euro price in US dollars. If you need more help, send a message to Kent, me, or others who respond. Any of us can and will try to help you! Good Luck - you'll love Italy! We all do!