Nick's place is very nice and cosy, and also very big by Roman standards! The place has a good position, with supermarkets, restaurants and everything you may need in a neighbourhood. Also, Trastevere and Garbatella are easily reachable on foot (which is a plus!). Nick is a great host and Elmo is a wonderful person, always available.
Definitely recommended.
Just to be extremely correct: the place might be a little rumorous, due to traffic and ambulances always passing by (the hospital is very close to the apartment).