Some studies show that in USA 30% of buyers are skipping the listings that do not include floor plans. The reason is that the floor plan represents the whole building or an apartment on one image. Hand-measured floor-plans not only help to promote any real estate sales. A plan like this will also come helpful to the new owners.
When I was buying my apartment I spend weeks studying the plans I was provided with. I could plan new furniture or even moving walls. with no plans, I wouldn't be able to plan anything until receiving keys, but with the plan, I could have everything ready by the time of moving in.