A fantastic camera! It's time you tried medium format through a waist level viewfinder!
The Lubitel 166 U is a camera i got before the Lubitel explosion on the Lomo site. I got mine from ebay from a very friendly chap in Scotland and for that i feel very attached to it. It takes marvelous photos with great contrast.
It didn’t come with instructions but with using the sunny 16 rule i have found it very easy.
The sunny 16 rule is you put the aperture at 16 in sunny weather and match the shutter speed to your film speed or the nearest. You can alter the aperture and shutter speed accordingly and it becomes easier with experience.
The top down viewer is very easy to use but its a little tricky at first to use the focusing ring, its mastered quickly though.
I’ve found that 400 iso Fuji Superia yields the best pictures and its best used during the day and could easily be converted into a nocturnal with a PC flash adaptor and a flash.
I love taking my Lubitel out and have “Lubitel days out” people stare but I have the patience to explain :)