The hotel has reserved a double room. Can you stay for four people? The family wanted to stay overnight to save some money.

Yes, the standard room 1.2 meters wide, with two beds. It's ok for two people to sleep in the same bed, but it's a bit crowded, but it doesn't matter if you sleep for one night. If you travel now, I suggest you book a hotel in advance. Today is New Year's Day, so you probably can't book a room. You can check the hotel reservation website. There are many choices and you can book freely.