Single room in a hotel for a party of 4 if we check out in the evening?

I'll be arriving in Milan, Italy by train from Rome around 12:00 and have to leave for the airport at around 21:00 the same day. I'm with my family of 4 and thought of booking a hotel room essentially just to keep the luggage there and to use the WC.
Do you think it would be possible to book just a single room for that purpose? Or that the Hotel would frown upon it?
Best Answer
Milano Centrale station has a [left luggage office(http://www.milanocentrale.it/en/service/detail/left-luggage1); for 9 hours the fee is €7.80. There are of course toilets (with a €1 fee), but unfortunately no shower. It seems that there is a wifi hotspot too, I can't find any information as to whether it's free.
While there are hotels in Milan with day rooms, you'd have to vacate the room by 18:00 at the latest. It doesn't seem worthwhile unless you really want to sleep.
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