Happy home is definitely a good choice if you want to stay near the airport but still want to visit Bologna by foot. Also everything is available, so that you can travel with light luggage: there are bedsheets and blankets, towels, soap etc. During our stay, the weather was very hot but you can use air conditioning in your room. You can also open/close windows without being bothered.
If you have rent a car, there is a private parking spot in a locked parking and you can self check in, which means you don't have to worry about your arrival hour. We also had a very good communication, Roberta answering my questions at any hours. Will definitely recommend the place !