Great place to stay for a relaxed time in Bologna. Central position, warm welcoming from Costanza, beautiful apartment with oriental atmosphere (it was once a yoga school and it's still used as a place of practice sometimes), many interesting books and a super lounge to chill out make it a best choice especially for those interested in Asian traditional culture.
I strongly suggest to take advantage of Piero's kind offer to have a yoga class for free in his yoga school just few steps away from the apartment, it was amazingly refreshing after hours of travelling.