is it ok to keep live mice and snakes in the same room?

[wilomn]

No, it is not O.K. to do. Just because a lot of people do it doesn't mean is right. Sure you can do it and be successful at it but you are asking for trouble. Once you acquire a finicky snake it will affect its feeding response and would be that much harder for the snake to accept a meal.

Upon what, exactly, do you base this opinion on?

I have kept multiple species of snakes in multiple rooms with mice, rats, both, and have not really ever noticed a big difference from ones that were kept totally apart from rodents. An eater will eat. A problem feeder is just that. Location may or may not make a difference for the problem feeders just as proximity to food may or may not make a difference for them, in my limited several decades of experience, anyway.