Good value for money.
Rosella's place is stylish and near to the Vatican (like a 20 mins walk). I didn't have the pleasure to meet her but I did meet her daughter who is friendly and helpful.
Rome is a big city, so take into account that to get to the city center ir would be like 45 mins walk or 25 mins by bus (there are plenty of buss station nearby and using the public transportation is super easy in Rome).
The room is small but yet it's confortable and looks clean and with style. However, it's too hot. I was there during summer and even though there is a fan, it's not enough to beat the summer heat (it is clear in the property's list that they don't have AC but I suggest get a bigger fan because it's not pleasent to sleep with the room being so hot).
Near to the place there are some restaurants, gym, salon, supermarket and basically everything you may need. So it's convenient.
Check out time is too early (9am) and there's no chance to leave luggage. So take into account that you may need to spend some money on lockers.
Overall, excluding the fact of the hot room and the check out, the property is a good value for money. I recommend staying in here if you don't want to spend too much money on accomodations. And also because communication is smooth and they try to help you.