We stayed at Luigi's für one night. Luigi is a very talkative and caring host, he likes to share his infos about the city and is really helpful. There are sometimes more guests staying at the same time, but there are two rooms. The location is really nice, short walk to the centre, not too touristy, safe ;)
There is a cute but very old cat, it's not spotless clean, but the apartment has some character. Bologna is just fantastic!