I like the model train set idea, spare bedrooms are also nice but they get dusty, renting it out to someone is an option but you also have full right to refuse to rent to them and that is where keeping the rent really cheap and only using word of mouth can work well.
If you want to let the rooms sit empty first thing to do is turn off the heat to them, plastic shrink wrap the windows to reduce heat loss, a layer of bubble wrap in there helps even more, set a few mouse traps if you are worried about mice, maybe a dehumidifier if you have humidity issues and close the door.
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