I visited about a year ago. It is owned by the same family who owns the Cambridge Tearoom in West Chester. Both tearooms are wonderful. The ambience is much better at the Simpson House. Sadly, it's further away from where I live.
My server told me that their scones are award-winning. I tried one and loved it! The tea selection was not as extensive as other tearooms in the area. My first pot was not brewed correctly, but it was cheerfully replaced when I asked.
I have visited four tearooms in the area and this is my favorite. Not the best in ambience, but definitely the best selection of teas and food. It is still closed for now, but I hope it re-opens soon.