The location is amazing, and I found it to be really good value for money, but read reviews so you know what to expect. It is a very loud neighborhood at night and you'll probably hear music and voices past midnight. If you're planning to be out late most evenings it should suit you just fine, but I would not pick this location for business trips.
The building is in fact old , so are the rooms. I prioritized the area, very close to the RER station, so I could easily make my way to and from the airport, and found it was so central I was practically walking everywhere. The hosts were kind, they answered all my questions and were able to accommodate a late check-out, which I certainly appreciated to make the most of my last day.