The second postcode should be G81 3AY.
There is a bus but you've got a ½ mile walk at either end of your bus ride.
Walk along the hotel's access road. At the roundabout turn right (onto The Antonine Road). At the next roundabout turn left (onto Halgreen Avenue) and follow the road around to your right. A short way along you'll find a bus stop (on the left side of the road).
Service 60 (towards Clydebank) runs from there. It's a 7 minute journey to Cambridge Avenue. Alight there, walk straight on and then turn first right right (onto Second Avenue).
When you come to a roundabout walk straight on but, just a few yards along, look for a footpath bearing off to the right. That takes you to your destination.
Service 60 timetables can be accessed here:
https://www.firstgroup.com/greater-glasgow/plan-journey/timetables/?source_id=2&operator=10&page=5&redirect=no