It is a fair walk from the wooden lodges to the lake. The wooden lodge is fully functional, separate shower room from your room. Yes, if you stay in the lodges last time I checked, you could fish the river, which held big barbel, chub and occasional carp.
The bridge across the mill is quite narrow, and the one across the meadow tributary last time I was there was quite steeply humpbacked. The barrow to getting gear to your swim is a must.
Prebaiting can be a yes and a no. I would prebait, but don't forget other people may like to take advantage of your work. The swims are all available, so someone could be in the one you prebaited, albeit unintentionally.
Walk, look, walk and look, always worked for me on there, nearly always with a stalking rod! I would take a bag of floating biscuits and bottom baits every walk, and depending on what they were taking...
I did that write up a few years ago, it is a long time since I fished there!