The place is great for a couple looking to explore the slightly less touristed side of Rome. The apartment is perfectly located in the Trastevere neighborhood, which could keep you entertained for several days on its own. There are dozens of bars and restaurants within a couple blocks. We walked to the Vatican (less than a mile), the Colloseum, and the Trevi fountain which are all within a mile or two.
You'll do best if you fix a time in advance to meet with Vanino, who is extremely sweet.