1931 and 1935 Valuation list has it in New Abbey Road. Proprietor is Josephine Carnegie. Occupier is Frank P
https://maps.nls.uk/view/75503261#zoom=5&lat=4570&lon=7567&layers=BTWill try to find a larger scale map(add- the1931 25 ins to mile doesn't show it as a named house)
It's on the Troqueer side (Maxwelltown) of the Nith - A710
Abbey House is not showing as a separate address on current postcode finder.