After the horrors of the infested apartment and the racist shopkeeper, Mr. Al is a breath of fresh air. While his interest in Chinese and kung fu isn't exactly culturally sensitive, he's the first person to not treat Ma and Kim as though they're nasty or a burden. This suggests that there are people around who are willing to help Ma and Kim, if only they can find them and attempt to build relationships with them. It's also worth noting that Mr. Al is likely aware that their apartment is in poor condition, so they don't have to hide their poverty from him.