Umberto is an excellent communicator. He consistently responded to my inquiries immediately and thoroughly, and in a very friendly and welcoming way. He is the best organized host I have come across through airbnb, providing lots of details about the apartment and what is available in Rome. He met me at the apartment and went through everything with me, then I didn't see him again but he continued to respond to my questions by email. The location is great for seeing the marvels of the Vatican. Also, San Pietro train station is close by and there are local buses nearby.