Haydn and Mozart became his friends; had their pianos made by him, recommended him everywhere.In spite of being illiterate, he advanced his business in such a way that he came into the possession of two houses.
A conscription sheet of Johann Jakesch's house Wieden No.
78 (today Wohllebengasse 15) from between 18 lists several of Johann Jakesch's adopted relatives.
He was cheerful, friendly, obliging, liked to tell stories from his life, and loved to speak in doggerel.
He was cordial and sympathetic, but harsh against his closest relatives, for which he might well have had his reasons.
Mathias Jakesch's younger siblings were orphaned in 1809, when their parents died within five days.