Casina Testaccio was amazing! Me and my sister stayed here for a week and loved it. The apartment is clean, comfortable and very stylish (love the bike as decoration!). The city centre of Rome is easily reached by foot (15-30min), but we've used public transportation a few times too. Rome is amazing, but Sara kindly provided us with a very cool customised map that showed some of the nice spots in the area. There are some really great restaurants in this area! Would absolutely recommend a stay at Casina Testaccio when you are in Rome :)