With a lever machine it is important to sit them at the right height if you want an easy life.  For the Bosco the manufacturer recommends that the machine is placed 950mm above the floor.  Having the machine up at this height, what you might call 'work bench height', allows you to pull the lever down  and finish the pull with the lever at approximately shoulder height.  Too low and you'll find yourself wanting to shift from a pulling action to a pushing action halfway through the tensioning the spring, and the novelty wears off rather quickly.

In the end we've opted for a unit that is 1050mm high, partly because I'm slightly taller than average and partly because the unit we like happens to be that height.

At the other extreme the Olympia Cremina works well sitting on a 700mm hight bench if you are tall, and perhaps a bit less than that if you're not.  This ensures you can comfortably use a 'pushing' grip for the entire stroke.