The flat is well thought and tidy. It's placed in the historical part of Rome, pantheon is just behind the corner. You can generaly walk from here to Piaza Venezia, Colosseum. We've been met by Raoni who gave us awesome tips around Rome.
One more thing, the host offers an airport transfer at a very good price, if you travel in a group of 3 then there's no point of using public transport.