My travel to hong kong in nov. My mum on wheelchair will travel with me.

I am travelling to hong kong in nov. My mum on wheelchair will travel with me. I am thinking
1. When arrive hong kong airport, I want to take express train to mongkok
2. We r standing at Stanford hotel in Kowloon, pse advise how I can travel from mongkok to hotel? Is there a free shuttle service?
3. I Thot of buying the airport tourist card for return airport express, the websites said unlimited mtr buses. But I am not sure what you mean by mtr buses? Are these buses commonly operated in Kowloon?
Please email me