Nutella you'd easily get bunk beds in there, and I think some furniture. And length - wise you should get a single bed and a cot top - to - tail along one wall. Even 2 singles (I think European ones are just over 2m long).
My SIL with 6 children has a double room for her/DH, a small double with bunk beds and a mattress for a little one, a very small single which has a cot but will be the boy's room at some point (the other 5 are girls) and then a small attic room with 2 beds.
She says the main thing is downstairs space, and having a room the adults can escape to. Would there be any scope to extend at some point or be fairly easy to move in a couple of years when the DC are bigger?
Spotty not a bad mummy. It's the price we pay for being working mums. If it gets really bad you can always use out of hours, and if he still warrants a Dr visit on Wednesday you know it needs it iyswim and can't be fobbed off with try calpol for a few days.
DH had to work slightly late tonight and I had to put both DC to bed. It took an hour and a half to get A sleep- that would be 30 minutes after DH got home and settled him. I predict a bad night.