I stayed at Maria Grazia's place for 2 nights, and it was a good stay!
Maria Grazia is a very friendly, kind host who communicated promptly.
The location of the apartment is good - it's not too far from some nearby gems (try Caffe Terzi in the morning for cappuccino, Trattoria Tony for a great tagliatelle and patate al forno). Walking to the main piazze (such as Piazza Maggiore) was also an easy 10-15 minute walk from the apartment - and there are other, smaller piazze even closer. It's also a very close (8-10 minute) walk from Bologna Centrale, the nearby train station.
The room is spacious and is equipped with a coffee maker, fridge, TV, and closets for hanging clothes. I had no issues with the bed for my entire stay. As Maria Grazia notes, there's no lift/elevator so be prepared to carry your luggage up several flights of stairs.
The bathroom is fully functional - there's enough hot water for 1 shower but the second person might have to wait a bit if showering right after someone else.
Finally, the city of Bologna is great. It carries a different energy from many of the popular travelling destinations in Italy, as it feels very local and relaxed. I highly recommend Bologna as a stop in your travels through Italy!