We stayed at this Apartement for 3 nights and there is like nothing we can complain about. Erika and her husband were very kind and they even picked us up from the train station. Whenever you needed help you could ask them and they were helping you out. The apartment was very clean. The bed and couch are very comfy and the kitchen has everything you need. The bathroom ist very modern and they even have towels and shampoo you can use. Just around the corner is a tram station that gets you everywhere. You can even walk to most sightseeing sports. The colosseo e.g. is only approx. 30min away. A 24/7 supermarket is just around the corner as well.
The only point of criticism is that the apartment is poorly soundproof. There is a restaurant next door and in the evening it can be a little bit noisy. But if you're walking around the city all day, like we did, you'll be tired by then anyway and just fall asleep right away. :)
Other than that we can only recommend staying at this apartment!