The flat is 2 mins walk from metro station and 10 mins walk to Roma Termini, the main railway station where you can also catch buses to the airport. Flat was clean and spacious and the best thing was that someone made our bed and cleaned the bathroom everyday while we were out. Building is quite secure though you might want to avoid the alley behind it at night time as I could see couple of guys drinking and shouting in it. That doesn't mean the area is in anyway insecure. Street right outside the building in busy and is full of shops and restaurants. We didn't meet Liviana but the guy who checked us in was helpful and provided us with all details necessary. Colosseum is only 15 mins walk. Good place to stay.