I would suggest that you begin by making a list of your dads likes and dislikes.
Is he a loner, does he like company. Will he be allowed to sit in His room if he wants to. Can he bring a TV and radio. Is he happy to be given a meal or would he prefer to choose from a menu.
Can he furnish and decorate his room. How many of his personal belongings can he bring.
My mum went in as an emergency case. I cried so much the first day as it was an old delapidated building, with loads of old fashioned furniture.
However my Initial reaction was completely wrong. My mum was very happy there for 5 years, because it all felt very familiar. The old oak furniture the decor was just what she was used to. She always went on about how lovely it smelt, I think it was the furniture polish. Her dementia made her very outspoken and I would say MUM!!!! To which she replied, " its my house I can say what I like". Could not ask for better than that. The staff were all middle aged and were very kind. They were all long standing. It was very small, only 18 residents and I would definitely say small is better.
One lady had a budgerigar in her room. Which the family cleaned for her.
After 6 weeks we were asked if we wanted to look elsewhere. We did look at other homes, but no matter what they offered in terms of activities, modern buildings, and outings I knew she would not have liked them.
My mum spent most of her childhood in hospital. She had an absolutely fear of clinics, doctors surgery and was phobic about corridors.
One place we looked at was lovely but the corridors were long, and I knew she would never leave her room if she was there.
Don't forget that he does not have to 'put up with' anything he does not like. Once he is settled, never be afraid to raise issues, ask questions or move him to another home if a appropriate.
My mum's home handed out regular surveys to get to understand the visitors thoughts and needs. The care home manager had his desk in the residents lounge. He and the assistant manager were always ready to speak to visitors.
Definitely a big no if it smells of anything unpleasant. Watch the staff,,are they gossiping to each other, expressing discontent with the managements.
Are they officious or friendly. They do have to be assertive but not harsh.
Look at how residents relate to the staff. The amount of banter and joking that went on in my mums home was lovely.
Finally, I know this is a very worrying time for you. My mum was in such poor state for a year before she went to the home. Within weeks she had a new lease of life. Regular, meds and food plus the company. She looked years younger. All her visitors remarked on it.
Sorry this was much much longer than I meant it to be.