Simon van Cleef was a son of Mozes van Cleef and Saartje Pierotto. He married in Amsterdam on 10 November 1897 to Judith Polak, a daughter of Abraham Polak and Doortje Cohen. The couple had six children: Saartje ( married in 1915 to Izak Pront but deceased in 1923), Abraham, Mozes, Doortje, Rebecca and Joseph . His wife Judith passed away on 2 January 1935 and has been interred in the Jewish Cemetery in Diemen.
Stadsarchief Amsterdam, archiefkaart Simon van Cleef, website www.wiewaswie.nl and Akevoth/Mokum/Burial Permits.
Guest house 'Van Loen' was runned by Abraham van Loen, who lived at the same address.