we visited Belleville while investigating options for MIL, it is indeed a lovely place.
before investigating such places first decide what your needs are, apartment, probably less hassle than a house, or are you the type of person that really enjoys his house and yard. Assisted living? not in need of daily nursing care, but need someone else to clean, worry about the details, be on call because of a chronic condition. this decision is different for everyone there are no hard and fast rules, but at our age, pre-medicare, we have to use this time to gather all the facts, with prof. help if needed, about what our resources and needs will be at retirement. When you know that, then start looking at locations.
Most dioceses have lists of Catholic nursing homes, which is not where you need to be. Actually most assisted living complexes were first erected in the 70s - 80s by religious denominations. It does make a difference if the one you choose is a non-profit or for-profit, so find that out, too. Also the financial deal for entering is different, too, and that will have a bearing on your decision.
Just don’t wait so long that by the time a decision is forced on you by age, infirmity or ill health you no longer have the resources to do what is best, or the capacity to make the decision yourself.