I would recommend you to stay at Gaia's place. It is just around 10mins walking from the river where the city life starts so is both close but also calm enough especially for those who need a time to catch their breath like me after a busy day in the city centre. Also, staying in a residential area gives you a chance to experience the Rome how it real is with a number of places worth to stop by for coffee or a bite. Ask Gaia, she will tell you were to go and provide you with useful tips on local transport etc! She will also watch for you when you about to arrive, coming back from your excursion or leaving home. Many thanks Gaia and hopefully we see again at some point!