I don't know if they repair holes in leather, but I took a leather shearling jacket that I'd inherited to be altered (taken in/shortened) to Le Couturier House of Alterations between Porter and Harvard Sqs, and they did a job that I was very happy with. I can't speak too much re:the price, because I didn't shop around. It was more expensive than regular tailoring, but a price that I was happy with as a grad student.