We had a nice time staying at Mariyka's place. The room description corresponds to the reality. Everything was clean and tidy. The bathroom is a bit small, but the price/quality ratio is perfectly fine for Rome :). We didn't met Mariyka in person, but there was another super wonderful and kind woman Diana who met us to show the apartment and then to pick up the keys on the day of check-out. Out of 4 nights spent in Rome the host was in the apartment only once during the night. The apartment is 20-25 min away from the city center by metro considering the time you left the apartment until you reached the Termini Station (Red Line). Apartment itself is 5 min away from the metro station Numidio Quadrato. The neighbourhood is quiet and rich with places for eating (cafes and supermarkets) and shopping :).
PS: we were a bit late with check-in time (due to 3 hours flight delay) and check out time, but that was not a big problem for the host (at least I hope so) :)