I live near there.
If you want to take the subway to the Calvin Hotel, take Metro Line 3 at the Baiyun Airport subway station (the Airport South Station of the subway) to Jiahewanggang Station, transfer to Metro Line 2 and get off at Baiyun Cultural Square Station.
However, after exiting the subway station, you have to walk a distance to get to the Calvin Hotel.
Take the subway from Exit A of Baiyun Cultural Plaza and walk there. It’s the closest!
After leaving the station, you can find it quickly by asking passers-by.