Correct Frame Size Trekking Short Legs
If you have proportionately short legs and a long body and arms, I would recommend against buying a bike unseen. You really need to test ride some bikes and get an idea of the geometry you need. 

You’ll need is bike that has a sufficiently long ‘reach’ (horizontal distance between bottom bracket and bars) so that your upper body is not cramped, but a short enough seat tube so you can set a shorter bottom bracket to seat distance. You probably also want a short ‘stack’ (vertical distance between bottom bracket and bars) so the bars are not too high. 

You’ll need to seek out and try a number of bikes to find a model that suits you.