This apartment is amazing, the location is much better than I anticipated. The colosseum is a matter of minutes away and the surrounding streets are peppered with restaurants and bars. Just at the end of the street you can sit outside to eat dinner whilst overlooking the colosseum itself!
The apartment is spacious and very comfortable, I actually slept better in this bed than I do in my own! There is a basic kitchen set up which was lovely for a home cooked meal after a very busy days walking when we wanted to save on some of the cost of eating out.
The addition of having a free washing machine and coffee machine almost outside the apartment door was an added bonus which we hadn't planned for.
There are 2-3 metro stations within around a 10 min walk meaning it's easy to get all over the city, although if you are happy to do a fair bit of walking it is easy enough to get all around the city by foot. We took the metro out to the Vatican one day and walked back (obviously via shops and restaurants).
If you choose this apartment you will not be disappointed.