You didn't say how old your son is, but that might affect the toy issue. I assume he is very young (i.e. the toddler bed) Probably what would have been "best interest of the child" is to let him take it back to you while brand new with the understanding that he will bring it back and then eventually leave it at Dad's so he'll have things to play with there too. I know I want my children to have "their things" at his house as well as here. It needs to feel like "their home" not just a place they visit. Remember, we're talking best interest of the kids here...
As far as the room, if that's all he can do now, your son is not going to be deprived or neglected. IT may feel like a fun adventure to be camping out at Dad's...or it may offer him needed comfort to be in the same room with his father.
One thing I am having to learn is that when it is "his time", I don't have any control or input into what they are doing or where they are. My Ex is a jerk and was a horrible husband and an absent father, but he won't endanger his children. So, I have to let up on the rest. You may have to do the same. I'm not saying it's easy...but look at the flip side. Do you want him telling you how to do things in YOUR home? I certainly don't!!