Diego and Serena were very accommodating in allowing us to check in slightly early (also telling us which bus to get from the airport). The apartment is a 30 minute walk into the central area of Bologna. My brother and I like walking, so this was no problem for us. The apartment is well equipped with toiletries for guests to use - ideal if you have forgotten anything. It also feels very secure, with gated access to the apartment block.
Upon check out, they kind let us leave our bags with them until late afternoon whilst we continued exploring Bologna - super, super helpful! :)
The only thing we found to be missing (given as a recommendation to Diego) was a kettle - instead we had to boil water for coffee on the hob, which was a bit of a pain. Overall though - great stay and would recommend.