The place could hardly have been better; Robert is an exceptional host, with an amazing knowledge of both the modern city and its roots in history back to antiquity. He is always willing to share his wealth of information (in Dutch, English, German and of course Italian), tips, and his richly filled bookshelves with his guests.
The apartment is in a quiet neighbourhood a bit out of the city center, truly between the Romans, yet one can easily arrive in Trastevere, and from there anywhere else in Rome. Robert has bikes available (mind the hills, but oh how lovely to see Rome by bike!) and the Quattro Venti station is within spitting distance. Supermarkets and some fine restaurants are around the corner, too.
Robert more or less split his house in two, the two (ample) guest rooms having their own bathroom, so despite the fact that he may be there himself, you can easily have your private space if you want to.
Highly recommended, without doubt!