Marvin and Luna's place is perfect. it is only 5 minutes walk from San Giovanni metro station and about 20 minutes walk to the Colosseum/Rom Forum area. Local transport is very easy with regular buses, metro and tram.
Our room was really nice – a big room in a quiet apartment with shared kitchen and two shared bathrooms. the kitchen had everything that we needed to make our own breakfast and occasional dinner and there were thoughtful extras such as a cold water dispenser and coffee-maker – we did not use these but they are very beneficial for those who would need them.
the apartment is in a quiet residential neighbourhood and it seemed safe at any time of day. Nearby there are a few restaurants, small shops and a supermarket and within 10-15 minutes walk towards the Colosseum there are many places to eat and snack.
overall this was a perfect place for our four nights in Rome and we would definitely recommend it.