All of our escape rooms at Fox in a Box - Chicago are private.
One of the things that sets Fox in a Box apart from other escape rooms is that all of our rooms are fully private and you will never be placed with strangers. Our rooms are specifically designed for small groups of 2-6 players because we find that it's more fun and less frustrating for everyone.
If you are a group of 2, you will need to pay for the minimum of 3 players, but you can still play with just the 2 of you and you will not be placed with anyone else. You do not need to buy out the whole room to ensure that you will be alone.
Here is an additional article that you may be interested in.