I would pronounce it "Shtendle". However, my wife (native German speaker) says it's open to interpretation, and it could possibly be pronounced "Stendle", without the SH sound, but "Shtendle" is far more likely. The only way to find out is to ask him.
yeah, phonetically like, and you are a good bit smarter around a keyboard than i am. (I have no clue as to how you made that itallicy capital B that sounds SSS)
On a laptop ALT-225, on a phone press "s" and hold, then select ß from the list of weird characters that appears.