Our stay at La Dolce Vita was really pleasant. It is true that we had to pay for the city taxes (3.5 euros a day), but the stay was very good. The place is really clean, Marvin is really nice, he gave us a map of the city and some tips.
It is a little bit far from the city center (30 min walk or so) but the place is just like the pictures show it. We have no complaints of La Dolce Vita and definitely recommend it if your going to Rome.