Me and my Mom stayed in John's place for a night. It was a lovely stay. The house is lovely, quite and has everything you might need.
It is a good bit away walking distance from the city centre so if you have any difficulties with walking this place is not ideal. Otherwise i would recommend it because you can walk and explore whole Cork, not just the busy streets.
There is also a bus that is very convenient to take you to and from the house.
John is lovely, very helpful with anything we needed and flexible with our check in and out. Plus he offered us a drive to the city centre twice.
Overall we had a lovely stay and would prefer him again if we are in Cork.