This old-fashioned 2nd-floor restaurant hasn't changed in decades. The menu has good-value classics such as cachupa (beans and corn mixed with fish or meat) and feijoada (bean stew with pork or seafood; both CVE450), and there's live music at Sunday dinners in summer.
Chave d'Ouro also has a few inexpensive guestrooms with shared bathrooms (single/double from CVE1300/1840).