I used to write a freaking long ass letter to my ex every Christmas stating all cute little things he done for me, things I appreciate/like about him. It's cute. But is your guy really into you and being super sweet nice boyfriend? Because if he not it might freak him out and push him away. If he's a good guy, sweet and nice, he's so into you right now, then he will appreciate it and think it's cute. If it's still early stage where you two still getting to know each other more, he might feel too much.. I don't know any details on your relationship so whatever you feels like I guess.
How did he react? Some guys are not used to getting compliments, so don't really know how to respond.
I think if it happened to me, I would act a bit silly about it, because I have never really had any compliments like that. But deep down I would be really happy and touched by it. It just might take me a little while to work out how to let the girl know how much I appreciated it.