over here in Germany we have houses where old people live together and cook for themselves etc., much like young people in student homes. Once a day (or oftener, if required) a nurse looks after them.
Maybe you have something similar in your country?
Also, how about asking around in your vicinity? Quite a few neighbours might have parents or grandparents in homes. They could tell you which in their experience are good ones and which are not to be recommended.
It would also be a good idea to get into personal contact with some of the inhabitants of such homes. They have a different point of view and insider knowledge. They can tell you what the glossy brochures forget to mention.