Great questions. I hope these replies are helpful...
1. Use rear entrance on Dech St. not front entrance on Elizabeth Ave. Park on Dech Street between Chelsea and New along fence to avoid getting a ticket (unless it is Wednesday when the optician is closed and you can use the parking lot behind Roosevelt's 21st). When you ring the bell, stand where you are in view of the camera above the door.
2. Always a good idea to call ahead here - as with anyplace else - as staffing is not unlimited and customers tend not to come in regularly spaced intervals.
3. No matter what gift you bring, the girls always act appreciatively and fuss as if you handed them the moon. After being thanked, you will be gently scolded for your generosity. In return, you will then be fed delicious Korean food, typically prepared by the very beautiful Hanna - unless it is Friday when Yumi is known to buy pizza and wings from Pizza Hut.
These lovely ladies are a treasure of hospitality in Bethlehem. There are few places where you will be treated so kindly AND get a great massage. Enjoy!