I have to roll my eyes at all the grid comments. The grid is variable. You can change it for a reason: some parts of a map are easier done on a different size.
how can they end up looking tiny?? if they do it's because you've picked a bad multiple to work with. 2:3 fits nicely into 8:12 which is probably the biggest you wan't steps to be.
Mine are 10 inches (american size 11 usually) + shoe.
Stairs in real life (yes I have done carpentry) are (generally) 12 inches deep and 8 high.
The old house converted to shop I work at that has STEEP stairs is 10x8.
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