Beverley and Michael's place is very convinient. Nice neighbourhood, new and modern building, clean bedroom and bathroom and very close to public transport - about 100 m from bus stop and 7 minutes walk from mascot train station. Once you arrived at Sydney AirPort, we would definitely suggest that you take taxi or Uber which will take you to for max 15 min ride from Sydney international terminal and about 10 minutes from domestic terminal.
Beverley and Michael are super friendly. They will answer all of your questions as much as they can. They will tell you where the locals go and how to get there.
In our last day before going to Sydney AirPort, Beverley advise us to have breakfast at the building next to them - in a small cafe called Tartine. Do try their menus, they are all very good.
If you like photography, you can ask Michael to show you some of his work, which are very good. They have visited about 70 countries, so you will see many places captured in an excellent angle.
Overall it was a very good experience and will definitely stay at their place again if we return to Sydney.