When Christian Schallert first showed his mother the apartment he had bought in Barcelona, she wasn’t sure what he had gotten himself into. The apartment, no bigger than a single room in an American house, was tiny, dark and dank. But not for long.

Using a highly developed "Ikea-meets-motorhome" sensibility, Schallert made good use of every inch of space by putting all the rooms of his man cave behind doors and in drawers. Check out how he can turn his living room into a kitchen, then a closet and a bedroom. You won’t believe where he keeps the bed.

Perhaps the only space that rivals this one is this apartment in Hong Kong.

How To Live In 258 Square Feet Of Luxury