@Cormac0, you seem a bit greedy: normally you only get 3 wishes from the good fairy 😉
I'd not set out to wish for 5 miracles - besides that's risky even in the fairy tales.
Help line: till a year ago approximately, the help line number was indicated on the booking confirmation. Seems someone decided that a few unhappy people are better than hiring enough staff to answer many silly requests. After all, those who reach the community center show already some capacity for problem solving. I think that's a petty accountant decision as the help number is one argument to gain trust.
Software: developping websites myself, I'd say it works amazingly well. Less so the CC software, but that's bought as a package.
The safety approach is good as well, but maybe they should put the optional double safety for the host accojnts on mandatory, so that you get notifications at every connection to your account by email. (At the moment, even if you chose the option, it's at every connection from a new browser). It has its own drawbacks: many mails and some people will declare it spam.
What is not clear on the invoices? You can get yours on a computer concerning your service fees, the guest can get theirs.
Star rating: The only thing really needed is the same explanation for both sides. It's absurd, that a value means "great" to the guest, when the same value means "not sufficient " for the host.
For ratings like location, there should be a short explanation what the guests are supposed to rate: location as described, location as being safe, or close to attractions or quiet or whatever. On my experience, in the location rating, guests rate how easily they found the place, how afraid they where and how comfortable it was to get around. I took care of those fears by a description that brings 95 percent to my doir after they read it (the redt uses gps and gets lost), explaing and showing on maps how to get to the sights and explaining where in town it is safe and where to avoid some behaviour. That transfmed my average 3 stars location into a nearly always 5 star one. Without moving the house 😉
A hint : indicate some distances in relation to the human body. 10 minutes walking seems closer than 2 stops on public transport. Half an hour walking seems no great deal, feasible, whilst a long line of stops on a bus seem like very far, inimaginable to walk that far.