"There's a lot of interest and there are also a lot of tourists who want to see it," said Claude Rotsart de Hertaing, a Brussels pensioner who works part time showing prospective buyers around houses.
The dilapidated five-floor Belgian townhouse, just off the central Grand Place square, has "La plus petite maison de Bruxelles" (The smallest house in Brussels) written across a faded wooden sign above the entrance.
It is not Europe's narrowest however, which tourist officials in Slovakia believe could be a 1.3 metre wide house in its capital Bratislava.
The Brussels house, squeezed between a pizzeria and a souvenir shop, has floors each of about 16 metres squared, apart from the ground floor which is even tighter as it has a pathway running to a courtyard down the side.
On one floor it has a potentially inviting fireplace, but you might singe your knees if you sat facing it on an armchair.
The house will be auctioned on February 6, starting at a price of 146,200 euros.