Where to stay and how much will it cost?
Small village homes or lodges are available at all these points. However, Maikhamba and Koon have only one home with one room, I'm guessing. Boodha Madhmaheshwar is a clean green meadow with no human settlement. All you can do is camp. And you can also camp around the Madhmaheshwar temple.
Rates are, as of June 2017, which is peak-season time:
Ransi - 500 for 2 people
Gaundhar, Bantoli, Upper Bantoli, Khatra Khal and Nanu - 100 per 1 person
Madhmaheshwar - 100-150 per person
This is the gist of it. If you have any further queries, feel free to leave a comment below. I'll get back to you as soon as I can. Stay safe, travel responsibly!