Cold Comfort is a great area for chars in the 30-40 level range, decent exp and a few choice pieces of eq.

Walk ( 4s, w, 2n, give 5000 coins receptionist, unlock n, open n, 2n, e, ne, nw, 2ne, n, enter painting, d, e, 2n ) to get from DH into the Frigid Wastelands maze, then scry for the room with a se exit, then go se from there to get to the room marked in blue on the first image.