I come here often as I sometimes work in the building. The lobby of the William Penn is gorgeous, and I would come to this particular Starbucks even if I wasn't working in the building. The staff is usually very friendly, and though the lines can be really long during the morning rush, they have an efficient system and things move quickly.
It's easy to pay through the Starbucks app on your phone here, and unlike some locations that give you a hard time, the staff here always thanks me for using my Starbucks app!
This location is great for sitting with a laptop that get some work done, but avoid the morning rush as it can get very loud.
I was very pleased with my double tall soy one pump hazelnut latte this morning. Some locations are known for their bitter lattes, but my latte this morning was perfectly smooth and enjoyable.