You know that sinking feeling when the doorbell rings and you remember you promised your cousin could stay for a week six months ago. The guest room you planned to set up is still a storage space for old suitcases and a stationary bike. If you live in a city apartment with a combined living and dining area that doubles as your yoga studio, carving out a real bedroom for visitors feels impossible. But with a few solid pieces of furniture, you can make your sitting area work as a sleep space without giving up your daily life. It just takes a bit of clever planning.

The backbone of any dual purpose room is a reliable sofa bed. I have tested quite a few over the years, and the ones with a click-clack mechanism have saved my back more than any other design. Instead of wrestling with a heavy mattress that fights you at every fold, you simply pull the seat forward and click the backrest down into a flat position.