This apartment is a wonderful little place for anyone visiting Rome and looking for a safe, quiet, convenient and fun base for exploring the city.
The best things about the apartment: while the apartment itself is tiny, the terrace is large, and gives views across the south east of the city all the way to the mountains. San Lorenzo is a fun, lively neighbourhood (thanks to the students at the nearby university), but once the windows are closed the apartment is very quiet. It's very conventient to the Rome central train station (about a ten minute walk), but also within walking distance of major attractions like the Colloseum or the Spanish Steps (about thirty minutes), so you can still do the tourist things without paying premium central Rome prices, all while living in a real Roman neighbourhood rather than a tourist trap. The apartment is clean, renovated and well maintained, so you won't have to struggle with stiff doors, rattling windows or creaking furniture.
The negative things about the apartment: like many older Roman apartments, the hot water system only works sporadically. Alex is very good about coming by to tease it back into functioning, but it will probably fail again after a while. The apartment is also missing some features, such as pantry items, an electric ketttle or a microwave, which are common in many Airbnbs.
Conclusion: I recommend this apartment to anyone who wants to get a taste of the real Rome while still being well-located for tourist activities, without sacrificing safety, quietness or convenience. I wouldn't hesitate to stay there again.