Although the images shows Princes Road, it's actually Princess Road.
According to the electoral register, (borough of Camden, South West St Pancras constituency, Chalk Farm Polling district Q ward 4) it's numbered 1-65 odd and 2-44 evens.
The buildings usually contain more than 1 family unit of eligible voters, ie 2 or 3 families in one dwelling.
In 1922, there are 6 eligible voters there - 4 Holland's, 2 Hovells
Dawn