Filippo's apartment is very beautiful and comfortable, and incredibly well located. The Trevi Fountain really is at the end of the street, and the apartment is very easy to find as the Trevi Hotel next door is an easy landmark for the building.
We did not meet him, but his mother was absolutely delightful and welcomed us like old friends.
Filippo sent us list of lovely places to eat and stay as well, which were most helpful.
I would definitely stay there agin without hesitation!