It is so cramped, that if the owner is sitting at her desk, you can go up the aisle on one side then need to step out onto the street in order to go up the aisle on the other.
But even here, we would not have found a mattress if we would not have asked. I had to go with the owner up the stairs at the back of the store and look through a large stack in a dusty attic to find it.
A little plastic rope to bundle it and a mile or so walk brought our new mattress to our home. We won't need to worry about this mattress going flat or the springs wearing out because here the typical mattress is a piece of foam. We went with the deluxe model, 4 inches thick.