We stayed here for a week and a half, and really enjoyed our time at Design Club Collection. The studio apartment was very nice, modern and clean, everything seemed very new and well maintained. Kitchen was well equipped and we comfortably made plenty of food here during our stay. The bathroom is well designed, modern, and the shower is the best we've had so far in Italy.
The beds are very comfortable, and the linen were of good quality. There is a little bit of sound from the street below in the evenings, but you're pretty high up and the windows are newer standard so we had no issue falling asleep. You are also in the middle of a city so you shouldn't expect total silence anyways.
The building interior is very nice, wide stairs, elevator and every floor has a small lounge group. The basement has a vending machine, as well as a nice laundry room with 2 washing machines and 2 dryers (all newer models) and garbage bins for recycling. Note that there is not laundry detergent included, but guests do often leave some behind when they leave after their stay that the next guests can use (was the case for us more than once).
Internet speeds are pretty decent, and when I needed an ethernet connection for work the building staff were very helpful in making sure I had one available which was much appreciated.
The employees are very friendly, welcoming and helpful, and response time is very low. Any time we needed something, they were able to help us in no time. That combined with the friendly cleaning staff that works in the building, it almost feels more like a hotel stay, which we definitely appreciated after 2.5 months of bouncing between other AirBnBs at the time.
The location is nice, very close to the main street through the city center with all its stores. The main piazza and the food district is also just a few minutes away on foot, so you're pretty close to most of the things you'll want to do in Bologna when staying with Design Club.
Highly recommend staying here, and when we decided to stay in Bologna for a few more days we ended up actually just getting another room in the same building because we were so comfortable here!