So this morning I went down to the Schaerbeek Maison Communale, armed with a digital camera (copies are €30 a pop) to dig out the plans for the house. So here they are, the original 1898 plans.
The facade:
Side cut:
The upper ground floor - at the back on the right is the old kitchen, with the steps going down to the garden. Note the entrance to the cistern at the top.
The lower ground, with a few steps going up to the garden at the back. These are the two rooms with the nice old tiles on the floors, we have an idea to turn them into a kitchen / diner, opening up the entrance to the garden. Notice at the top right the wine cellar (under the old kitchen) , which has a well ("puits") , as well as the cistern on the left next to the steps.
A close up on that cistern / well detail. Something to investigate further no doubt.