Location is just perfect! Colosseum is on just 10 minutes walking distance from the apartment. Also there is metro stop, again around 10 minutes walking distance. You should take it to the Vatican city - it is around 30 minutes travel.
The apartment itself is very nice. Small and charming.
The host is very responsive and nice, answering in 10 minutes max.
Additionally there is cafe just next to the front door of the building, bus stop and on the corner there is super place to eat - bakery Antico Forno. The best Margarita we had in Rome on very reasonable prices. Recommend it as well.
As summary highly recommended place to stay and have a awesome time in Rome.
Surely we would stay there again!