We spent eight nights in Bologna, using it as a base to visit Modena, Parma, Ferrara and Ravenna, as well as exploring the city itself. Diego's flat was ideal for our purposes. It is only five minutes’ walk from Bologna Centrale station, which is also a stop for the bus to and from Bologna airport. The flat is on the third floor of a residential block (with a lift) and is no more than 20 minutes’ walk from the historic centre of Bologna. Apart from the final evening, when there was a noisy party nearby until nearly midnight, it was very quiet. It was also very clean. The flat is modern, comfortable and well-equipped, with a compact living room/kitchen, a decent-sized bedroom and a bathroom/utility room with a good shower. We didn't make extensive use of the cooking facilities, preferring to eat out in the evenings, but the induction hob (complete with a stove-top coffee maker and kettle) and fridge were perfect for making breakfast. There are two good, inexpensive restaurants around the corner from the flat (Il Veliero and Il Verace), as well as a small grocery store, a bakers and a Coop supermarket nearby.
We had no problems with the flat during our stay, but getting into the flat on arrival was a bit of a challenge as the virtual key access system did not work as it should have done. Despite getting an email beforehand confirming that we had successfully completed the online check-in process, we had to message Diego to ask him to open the flat for us remotely - which he did promptly. Thereafter we used the keys available inside the flat to access the block and the flat without any further issues.
We would happily recommend Diego's flat to other visitors looking for somewhere to stay in Bologna, especially if they are also intending to travel around Emilia-Romagna by train as we did.