Looking for title or author of a short story where a man inside a house that has no windows or doors tries to remember things as if he is suffering from some kind of amnesia. The reader follows what the man is thinking and I think that there are some people in the house at some point but they keep disappearing; I don't' remember if he actually interacts with the people. At one point the man stares at a model of a spacecraft or a plane sitting on the top of a piano and he tries to remember how he is supposed to relate to the model. He doesn't remember the model being there the last time he looked at the piano; who put it there? What is the piano for? He then gets this funny feeling about how things are all ready for him, all the time. Food, clothing, I think there is a speakerphone somewhere that gives him instructions.
By the end he sees someone leaving the house through a latch and follows the person outside the house. The house is a kind of a cottage in a woody area and the police appear and surround him. That's when we learn that he is an alien metamorphosed into human that had been captured during the hibernation status and put in the house to be studied. Who is the author, the title ? Please help me.