how to babysit a one year old boy?

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my brother and sister in law went to Hongkong to purchase and travel.he asked me to babysit his son for two days and gave me 200RMB· i thought it's a good deal.yesterday,he is well-behaved,maybe we are not that close,he is a little bit afraid of me.i followed brother's words--feed him milk when he needs and give him toys and take him walk after dinner~ he came into sleep about 9,and i started watching shows,12pm,i came to bed,but terribly, i was woken up at 4am by his noise,he kept crying ,when i got to check him,dolls and blanket are on the floor,peeing on bed!!!i have to change a diaper ,by the way i feel gross,and i really don't like doing this... on the other hand he kept crying~ which means i still can't sleep·then i held him in my arm ,shaking a little ,humming lullaby,he didn't cry ,neither did he sleep.he stared at me,weired,,,then i put him into bed,then there went crying again,,,are u gonna torture me this whole day?i asked him~ everytime i hug him ,the cry stops,but i put him in bed ,he cry/// finally,somehow i fell into sleep ignoring his crying or not~~ and now, brother is home,,,i gave the boy back~~~ which make me feel not easy about being parents~