We had a lovely four days in Serena's apartment which is beautiful and in an excellent location. It was really easy to communicate with Serena, who was very friendly both before we got there (responding to emails very quickly), as well as when she met me upon arrival. The flat itself was spacious, clean and beautifully decorated, with all the amenities you might need. Despite being in a bustling area, it wasn't noisy at night, and it meant we could walk to the Vatican within 10 minutes - very useful when trying to avoid the queues in the morning! It was also a quick walk to the nearest Metro station so we could easily reach other sights in the city. All in all a great place - would definitely stay there again.