You've got the same digs booked I had, the OakTree is a cracking pub, I was in one of the cottage rooms, very good, bar meals are great, with a good atmosphere in the bar.
I see you've been to the Drovers so you'll know what to expect !!!
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Bunkhouse at BoO is basic, showers a bit iffy, good drying room and a good bar/ or restraurant for something to eat. In May they recommended booking the evening meal in advance as it is the only place for miles and was quite busy when we got there, maybe worth a phone call as they serve food in the small bar and in a white table cloth and candle restaurant, kinda surreal eating in there after a couple of days on the road.
Cabins at Kinlochleven were my favourite, just like garden sheds with power and a midge zapper with a couple chairs on a little veranda, feet up and a couple of tinnies after the meal, bliss.
All the places served breakfast a little late for me, from 8:00, but soon adjusted to that, they all offer reasonable packed lunches, and think some of them also did something in lieu of breakfast if you wanted to hit the road early. Personnaly I couldn't do without my coffee in the morning, even getting an espresso at Kingshouse bothy bar (round the back)
Couple beers during and after the days walk was almost essential, I got probably the best stint of weather I could have hoped for, apart from some drizzle over Rannach Moor.
I don't know if anyone else feels this or if you have been told what to expect, but I went into the walk thinking I had been given a good heads up regarding all aspects of the walk, but I wasn't prepared for how rough some of the paths/ tracks can be. I would say the vast majority of the walk is done on very rough, rocky terrain which is hell on the feet and knees, didn't help that I had quite soft walking boots. Probably the only snag I had the whole walk, my dogs were barking everynight!!
Once agian, good luck and have a great time