Very good location, good accommodation and nice price. 5/5 in total.
PROS
Quite reachable distance from city center and amenities.
Main train station Termini - 30 min on foot
Transport hub Porta Maggiore - 5 min on foot
Metro station Manzoni - 17 min on foot
Groceries store Eme Piu at Via Principe Eugenio/Viale Manzoni on the way home from Manzoni metro station - 10 min on foot.
Coliseum - 40 min on foot.
Furnished with little bit worn but still usable sofa-bed, coffee machine, WiFi, tea kettle, nice tiny fridge. You get some tea bags, coffee, sugar and croissants for breakfast.
I think price was very good for the place.
CONS
Windows open right in to the railroad. If you can't sleep with noise outside it might be a problem. It was not that bad during the stay as we got used to the noise quick but it might be an issue for some of the travelers.
No air conditioning, this means that you're going be opening windows to get some fresh air and thus you will hear the trains even better.
Avoid coming to the place by Via Marsala and Via di Porta S. Lorenzo - this place is full of bums and lowlifers. They don't bother showing in Via di Porta Labicana closer to the Porta Maggiore so it wasn't like that the whole place was full of them, but you should avoid the mentioned streets. If you're wondering alone late at night, the district does not seem to be the safest but it wasn't like living in Hell's Kitchen, just use taxi if you need to come or go at like 1-5 a.m.
MINOR PROBLEMS
Sometimes clogging shower, sometimes at night WiFi stopped working.