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The below link gives you the questions you should ask as well as what to look for, you may also add to the list based on your own personal experience:
https://www.hospicenet.org/html/questions.html
All my questions are listed on the web page. But I would consider asking if you can view the nurses at work. See what they are like when they are at work without them being for warned. It would be nice to know what they will be like when they know your not around.