We enjoyed our stay in Tiziana's apartment and made good use of the terrace even in December. The location was good - 5 mins to a metro station or a 15 mins walk to the Colosseum. A large supermarket was a 5-10 mins walk away.
The apartment wouldn't be suitable for anyone with mobility issues/lots of baggage as it's on the top floor and there's no lift. But the roof terrace makes the stairs worth it!
The only real issue we had was an overwhelming drain smell that was present at all times and very strong in one bedroom even with windows open. I reported this so I hope it's now resolved.
Overall we had a good stay and would recommend Tiziana's place.