For Aroma Tea House, which airport bus should we take from Hong Kong International Airport?

You are suggested to take a flight to GL first, which takes about 1h 30 minutes. After that, take Shuttle Bus –Minhang Building Line to the building. Then you can take a taxi to your hotel, it’s only 3 km away.

My apologies. I meant from Guilin International Airport initially, and not Hong Kong airport. =

Any idea how much will the cab cost from the International Airport to Aroma Tea House?

Was thinking will it be cheaper for 4 persons to just take cab rather than taking the shuttle bus and then still require another cab the the hotel.

Yes, the cab for your four is cheaper, and it costs CNY50-60 in total. By the way, the Shuttle Bus costs CNY20 for each.