It is a well-kept flat with nice accommodations. Very good tea, coffee, and water was provided. It is in a great location with great shopping and it is not far from the Trevi Fountain or the metro. The host is extremely responsive but did not give any explanation about the check in process or location ahead of time. I recommend reaching out ahead of time to coordinate checking in.
We visited in February. The flat and floors did get extremely cold overnight. I suggest to bring warm socks to walk around. Unfortunately, we noticed a very bad smell coming from the bathroom after the first night, this might be a plumbing issue and could have been unusual but I am not sure.