Even though we didn't meet Sabrina in person, the check-in was organized and easy for us. The apartment looks exactly as on the pictures and it took us 15 min via bus to the Colosseum. The buses depart near to every five minutes. We can only recommend to stay in Sabrina's apartment. She's answering questions pretty fast and gives good advice! Her tip to eat at a restaurant near the apartment was awesome.
Also, you don't need to bring towels and shampoo if you want to save some weight for other stuff.
Thank you! :)