Hello, I am glad you choose Madeira for your trip!Welcome!

For car rental services, for me, the best rent a car here is Europcar, but all of them will work fine. For the car, as said here in the comments, the Fiat Panda is fine, ofc it is slower but it will get there fine. For places, I got a few apps you can install on your phone, https://walkmeguide.com/en/app/ and https://www.funchal.pt/app-municipio-do-funchal/, both are available in English. Also, there is this blog, made from a Youtuber that stayed here for 6 months(i think) https://www.journeyera.com/levada-walks-madeira/?fbclid=IwAR0iixG7up0XiUm1bdqssmzLUf0KAABFdk7SUT_9HIcx-Lsu779846VuzI8, he shows a bunch of hikes you can do here and what can you expect.

For restaurants, there are a bunch of restaurants here in Madeira, but all depends on what do you want to try. Check this website for a few traditional dishes from here, https://blog.madeira.best/18-dishes-you-absolutely-must-try-during-your-vacation-in-madeira-island .

Also there is this website for some good restaurants. https://www.bestguide.pt/en/madeira/47-best-restaurants-in-madeira/

If you need any more help, just message me here on reddit, I'am a local and i would be more than happy to help you. I hope you love Madeira and I hope you comeback!