It may be difficult at first but just like everything else, you all will adjust to it and find your routine that works.
We are getting ready to put our two boys (3 and 4) in the same room and I think things will work just fine. My kids only sleep in there rooms, get dressed and play very little. We keep all of our toys in a "playroom" or "play area". That helps keep the clutter out of the room they have to share. Get each child their own bed and have their own side of the closet, even their own special "bucket, toy box" for only their stuff. That will make them feel like something is there's only. I know they are little but it still does matter.
I know the nap thing will be hard but you'll just have to try and teach each child to be as quiet as possible when entering and exiting the room if someone is sleeping. As well as their nap schedules will continue to change as they get older so they may not be different times eventually (hopefully); and they will not take naps at all at some point. So this stressful time is only temporary. :)
Not any great advice but just some thoughts.
Best of luck.