The host gave us two possible times to drop off our bags, which allowed for a measure of flexibility. They had suggested we leave our bags at the train station, but the line was very long. It was not clear how the system worked until we had already waited a good 30 minutes. It was necessary to obtain a ticket with a number from a machine. We decided to take a cab and check our luggage at the MAXXI, rather than spend any more time waiting in line. Our time in Rome was too limited. There are luggage drop off places in Rome, and it would have been helpful to know about these ahead of time.