We stayed in this lovely apartment for a week. What can I say? It is definitely the best place to stay in Rome! The apartment is exactly as listed: spacious, clean, light and very comfortable. It has everything you might need and even more. Lots of guidebooks and maps to use (I really appreciated Gambero Rosso). Just be careful if you are taller than 180 cm - mind the low ceilings.
The area is superb - close to everything by foot (we only took a bus to get to Vatican), metro, buses and taxi are all a block away if you need them. Lots of restaurants, wine bars, pubs nearby, a nice bar just next door for your morning coffee and cornetto, a bakery 1 minute away, good supermarket and 1 mini-market within 1 block, discount supermarket at the end of via Ostilia. Lots of sights in the area besides Forum and Colosseum which you can explore without too many tourists.
Andrea is very helpful - he gave us good advice on places to eat, helped with the TV when it was needed. Check-in and check-out just could not be better! Besides, he lives upstairs so everything can be settled quickly in case there are any problems.
It might be a bit noisy at night, but you can always close the windows and turn the AC on - parties outside will not bother you.
We will definitely stay at Andrea's place again when we are back to Rome!