Surprisingly for a 16-year-old boy, Sasuke is incredibly neat and tidy. Part of this is because he believes that anything that's worth doing is worth doing flawlessly. Part of this is because the last time his house was a mess it was because it was covered in his family's blood.
Sasuke has had to raise himself since he was 7 years old or so. He's surprisingly good at domestic tasks like mending garments and cleaning, as well as cooking. Though he's only familiar, naturally, with Japanese-style dishes.
His birthday is July 23, making him a Leo. Which basically fits him like a glove. Words used to describe Leos include things like vanity, stubbornness, melodrama, pride, and loyalty. Does that sound like somebody we know?
Sasuke has a reputation for backstabbing, but he's ultimately loyal to the Uchiha clan and never claims otherwise. If somebody is deluded enough to think differently, though, he rarely bothers to correct them.
In the original Japanese, Sasuke doesn't use honorifics when addressing people. For anybody. This is supposed to be incredibly rude, though not quite Sesshomaru-rude. To keep the tic in English, he'll be on a last name basis with pretty much everyone. If he wasn't going to be polite for Orochimaru or Madara, what chance do you have? ;)
According to the databooks, he hates sweet things. He also dislikes natto, which I am 100% behind him on because it looks and sounds horrible.
His favorite foods are tomatoes and omusubi (rice balls) made with okaka (which is a dried, fermented tuna product).
Interestingly, both tomatoes and okaka have a strong umami flavor so he'd probably have a fondness for other related foods like green tea.
Rice balls are also a traditional portable food, which makes them convenient for a ninja to carry with him.
According to the databooks his hobbies, if you want to call them that, are training and taking walks. Avengers don't need hobbies
When he was a young boy he was apparently very fond of cats, and still likes them to this day. And if you've got a problem with that, fuck you cats are awesome okay.