The location is perfect! Learn the easiest way to Old Town Square...take Mansa west to Dlouha turn left. There is a little street one block up, turn right for one block, and there is a passageway that leads to Revolucni Street, right to the Penny Market, Pharmacy, etc. This is a fun neighborhood, with local bars and cafes. It does get a bit noisy at night, from people out having fun, but that did not bother us in the least.
There is a narrow spiral staircase that leads to the attic apartment, that I do not recall reading about.
The hosts were very responsive and available, as we had a minor issue.
We were comfortable in the apartment.
I would absolutely stay there again!