You could maintain a guest room, or you could have Stay at my Home, designed by Nichole Lehner and Luzia Kälin of Designasyl, who write:
In our opinion, hospitality is a very important virtue. "stay at my home" is a series of objects for the good host. It enables him to install a comfortable overnight stay for his guest.
It is evidently a special mattress, "Due to a special foam composition, the mattress can be rolled up and stowed away under the furniture."
It has everything: bedding, storage, even a lamp.
The furniture serves as a basis for the guest, here he can place his belongings. In the drawer of the furniture, cover, pillow and the bedside lamp are stored. The drawer can be removed from the furniture and can be placed as a storage box within easy reach from the bed. The torchlike lamp simplifies the orientation for the guest. The arrow-shaped carpet does not only symbolize the warm welcome, but can also point into a room as an invitation. The light weight objects offer the guests the freedom to position the bedding as they like. The series doesn’t have to be hidden in the attic anymore, but forms an ensemble that can stay in the living area.
Looks comfy. Stay at My Home via Dezeen
More Less is More:
Expanding Bookcase by Reinier de Jong
Little Portland Cottages Built from "Found Objects"
Transformer Furniture: Quickie by Jared Dickey
Less is the New More: Making the Most of Small Spaces