Carmen's place was small, but clean, cosy and artistic, with small conveniences like hot water pot, hairdryer, small fridge. Carmen was easily approachable and gave us some extra help - like providing an iron and printing out our tickets, as we forgot to do so earlier. She gave us clear directions how to get there, but almost none were needed anyway, because it is exactly opposite the Termini station. It is indeed really close to the Colosseum - 15 minutes walk, 5 minutes walk to Piazza Repubblica, not far from the city centre as a whole. The beautiful Santa Maria Maggiore is few blocks away. More benefits from being next to the Termini station - there are a lot of shops inside - almost like an airport duty free zone and a big food section with different types of cuisine. The neighbourhood was somewhat dirty, but it is not a surprise, being close to a train station.