The apartment was nice, we were close to the Colosseum and then to other monuments. We only used the metro once during our stay when we went to the Vatican. The apartment is located on a noisy street, so when we wanted to have a window open during the night, there was a huge noise coming from the street. The next night we closed the window and used the air conditioning.
The negative was that we agreed with the owner in advance that we do not have to wait until 3 p.m. at check-in, but we can come to the apartment as soon as we arrive in Rome. However, when we arrived at the apartment, there were still previous guests and then we had to wait another two hours until the owner cleaned the apartment. The owner could tell us immediately that we were to arrive at 3 pm, and we could come up with another program.