there are street directories (eg try museum shop enquiries@mnh.gov.im) however if you get a copy of the Manx telephone directory (usually free to callers at office of Manx telecom) there are street maps etc at back.
Ballaquane is a quarterland just north of Peel on coast.
Stone mason just means he built from stone (bricks were little used on Island until c.1890 eg my flat in Peel built c.1895 has 18inch peel sandstone wall with a north welsh brick facade (curtain) wall.

Some aspects of your queries are covered on Manxnotebook (esp German properties) - see tabline