Everything is perfect! I highly recommend "dAndy Suite".
The host "Andrea" was very helpful and thoughtful. Despite the late hour, He and his friend "Paolo" came out to pick us up at the train station and greeted us warmly. Also he prepared the welcome food and various refreshments. It was very touched because these are includes my country's things. And he provided helpful information(city maps, restaurants or stores nearby) and the pocket wi-fi, which was very very useful.
The location is also good, very close to metro(1-2 minutes), train station "Termini"/Colosseo(10-15 minutes) on foot. The neighborhood is calm but there are several big and small stores/restaurants (very close to "Fassi"-the famous gelateria). The apartment is very clean, cozy and well decorated. Also the kitchen utensil is quite equipped.
It was really excellent overall. If I visit in Rome again, I would definitely stay here again.