If you come with a party of 4, will you be in a room with other people as well? Or can the 4 of you do the room yourselves?

Yes all you want to have can go together. We had 10 in our group.

You can do the room with just two people. My wife and I did one alone.

Give them a call. They will accommodate your group. They did it for us. The more ppl the merrier. There are a lot of puzzles to get done and the less ppl you have the more you have to do.