Our stay at Martina's apartment was perfect. The communication and check in was hassle free and Martina was helpful sharing local knowledge of attractions and eating establishments in the area.
The apartment is in a great location, close to Republica station. Its even walking distance to quite a lot of the major sites and there's some great local eateries.
The only small issue would be that it can be a little noisy due to being so close to via Nationale but nothing that a pair of ear plugs doesn't sort out.
I would definitely stay at Martina's apartment again and would highly recommend it to others.