Hi Kerry,
I just did this tour April 29, 2018. My first ever tour and also solo. It was one of the best vacations I've ever had. I arrived in Paris 1 night early because I had been there before. I signed up for a 'Paris Greeters' tour. It was fantastic. Volunteers who give you a walking tour. You do not pay or tip but instead donate on the website. I had a terffic 3 hours seeing and learning so much off the beaten track!
At the end I stayed 2 extra nights in Rome. I must admit most left and for the few of us left if felt so strange and empty without our wonderful buddies and tour guide. I wished that morning I was moving on because it was quite the let down! However, I was on my own and as a couple I'm sure that'll be dfifferent. I went to Trastavere and did the Rick Steves walking tour, it was great and I recommend going as it's not on the tour. I also just re-visited places to get a last look and did the Vatican museums but that was so crowded it wasn't fun!
You will love this tour, I'm so envious of you. Our tour guide was Tina and she was incredible, every day was a 'wow' day!