I'm looking for a slang-word or idiom, with emphasis on the fact that the person never pays his debts. Such a person is always borrowing small amounts from friends and relatives (say, €20 or €50) because he knows it's much easier to get away with it. It can also involve bank loans and credit cards, but the main fact is that he is notorious for not paying back small amounts he borrows from friends. The term I'm looking for is a noun and would be used in a sentence such as this:
Attenzione, perché Giuseppe è un _____________ben noto.