We (three jolly fellows) arrived on Saturday afternoon to this cottage. Fist issue was that we did not dare to climb up the access road with rental Ford Focus Wagon - we were afraid it would get damaged - no grip when climbing slowly and with higher speed the bumps would most likely damage the car.
So we parked the car in a small offroad place about half way to cottage. After couple of days neighbours (local people living close to cottage) knocked our door and complained about our parking saying it is dangerous and adviced to park in the end of Linn Walk. We did not find our parking dangerous, but decided not to disagree. We did park the car there every time after that. No problems after that. Access road does not have any lights so it is a good idea to have a flashlight or something with you when walking the access road.
The cottage itself was nice. Modern equipment, tidy and clean, heating worked nicely, enough towels and bed linen. The WiFi connection worked fine and came in handy, because the mobile network is not great in these areas. In Garelochhead you can find basic things like shop, pub, post office etc. There is a big military naval base in Garelochhead, but that doesn't bother the stay.
Location of cottage is very good when exploring the Loch Lomond area or other nice places in nearby, also Helensburgh is about 7 miles away and there are more shops & restaurants and supermarket like Waitrose. It takes around 45 minutes to drive to Glasgow and the way there is quite straightforward through Helensburgh. We travelled one day also to Oban and Fort William and back to cottage. Other day we travelled to Glenturret (Famous Grouse) and Blair Athol Whisky Distilleries.