I had an absolutely amazing time in Arianna's place:
1) first of all, location could not be better. This is the only location in Rome where one has immediate access to both subway (Piramide) and train (Ostiense). Thus, one is within 2 short subway stations away from Colliseum (pretty much 5-7 mins ride; or 15-20 mins if to factor in walking to subway station, waiting for a train and duration of transportation itself) AND 2 short train stations away from St. Peter's Cathedral in Vatican (again 5-7 mins by train or about 20 mins door-to-door). Transportation to / from airport could not have been easier as well - given that there is direct train going through Ostiense to / from the airport. Moreover, Eataly is within 5 mins walk (for dining and grocery shopping) as well as a bunch of restaurants and cafes - and the best part is that this is not a touristy location - so you will get to dine and experience as a local!
2) Arianna is an amazing, amazing host! Check-in / check-out were super easy. Breakfast was phenomenal. I combined business with pleasure - so asked for breakfast at different times on different dates - and it was at my door at exact time I have asked for - I really felt myself spoiled during these days!
Overall, I would highly recommend Arianna's place to anyone and would love to stay there again if life will ever bring me back to Rome.
Grazie mille, Arianna!!!