It was a good choice. Close to the metro (about 3 minutes by foot), Vatican Museum (about 20 minutes by foot). The host was kind and his reply was fast, which made my sudden reservation.
As a non-European, the only problem for me was that it was not a female-only dorm, but I used the room with two other girls by chance during the whole trip days. Overall, everything was perfect and I'd like to visit here again once I come to Rome later. Thank you so much.