First of all I would like to say that Lillos apartment was our best airbnb experience (after using the service six times). Nicolo has been - without doubt - the best host. The place is very spacious (I would say 90m2) and you will find real, solid furniture. It is almost IKEA-Free. The rooms are big and, if you have a baby, there is a crib. We were four adults and a baby and we very confortable. Nicolo waited for us with some useful items, especially if your stay is rather short: milk, coffee, some fruits, juice, oil, butter, jam, etc. From our experience it is very unusual to arrive and to find all these itmes in the fridge. The flat is also very good located: 20 min by foot from Vatican and 20 min from the spanish steps (we were walking with a baby...). We also used the transfer form the flat to Fiumicino. You pay just a bit more and someone picks you up avoiding carring the lugagge.
Definitely I would recommend Nicolo's flat.