Gela

is he toilet train?

if not, get some newspaper, buy the toilet train spray from pet shop and spray on the newspaper.
If not, then bring him downstairs to "smell" the grass and he might juz auto do his business.

Food, get a pet bowl and fill up with dry food. At least he is hungry he can get some bites.
Able to get wet food for him too.. But quite expensive, 1 meal like 3-4 bucks and have to feed 3 times? That is what I do when I have a poodle with me few years back.

Sleepy, just let him sleep.. lolx.. quite simple =)

How to tell his needs, actually very hard cuz is ur uncle's dog. So maybe you can ask him? He might know clearer.