Does anybody recognise anyone in this photo?

A photograph of a large group taken at Bad Kudowa in 1922. My grandmother was staying at Hotel Austria and is in the photograph, towards the back. There may have been another (female) guest there by the name of Rapaport, to whom my great uncle refers in one of his postcards to my grandmother while she was there. The other puzzle is that the cards, although sent to the hotel and clearly marked "fir Frau Rosenberg", were addressed to Hern Polak. Would this have been the hotel owner? Why would he have addressed the cards in this way? From what he writes, we are beginning to suspect that there might have been a relative in Kudowa, maybe the wife of Herr Polak? We know that there was a sister even though we do not know her name. The postcards, in Yiddish, can be seen here and here. If you recognise anybody in the picture, or know how I might discover more about the Polaks, please let me know.

Group at Bad Kudowa 1922