We went from 18-19.07 to the marble canyon of Ruskeala by a company of 10 people with the travel agency "KareliaGid" (http://kareliagid.ru/). Wonderful reviews on the site and in contact about this travel agency, only now it’s clear why, first they ask to send a review in a personal message. A prerequisite was accommodation in 2-bed rooms in the same hotel.