We haven't met Arianna, but her roommate Vanessa met us. She was very polite, kind and friendly. She advised us interesting places to visit where we tried local cooking and could get the beach with her help.
The appartment is not so big, but clean, light and there are everithing that you need as noticed in description. It's 30 min walking from the Colloseum and 10 min from metro station Re Di Roma.
So we reccomend to book this variant for all who wants to live not far away from the Rome center and pay for it not so much.

Thank you, Vanessa and Arianna!