I can only recommend Salvatore's place. Salvatore is a great host and made me feel welcome from our very first contact via e-mail, being very helpful with travel and public transport advice. The neighborhood is a quiet residential area and I slept like a stone on the comfortable king-size bed. In Salvatore's place a spotless, stylishly furnished room with a separate bathroom and shower will be waiting for you. Will definitely come back to your place next time I am in Bologna...