Had a lovely experience at Cinzia's place for my long stay.
The apartment's location cannot get any better - right in Piazza Santo Stefano, which is one of the main points of interest in the city. I found it as a great location to base myself in Bologna (2 supermarkets, a gelateria, a pasticceria, and many cafes and bars all are 2 mins walk away).
Amenities-wise, I had everything that I needed. I do wish there was an oven in the kitchen, but I managed to get by just fine with cooking on the stovetop. The fridge comes equipped with a small freezer compartment as well, so people staying for long periods can also make use of this. The sofa-bed was also just fine - I had no problems at all with my back. For cleaning, there is a washing machine that's hidden away in a wall unit (don't think there were pictures of this, but it was mentioned in the amenities list), as well as other cleaning tools and supplies.
All in all, I can definitely recommend staying at Cinzia's apartment. I've had a wonderful time here, and will definitely consider staying again next time I'm in Bologna.