in one word WOW!!
Marta's place is everything you look for....
the apartment is clean, well decorated and fully equipped with everything you need. you have two bathrooms which is very comfortable after a day of touring Rome (very hot in the summer).
Marta is a great host she informed me with all the ways to reach the place before getting to Rome, and during our stay was eager to help with everything.
the place is close to the city and to the Metro bus and trains (Termini station).
I wish that every experiance in airbnb will be like that...