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1) Depends on whether you have a downstairs or not
2) Depends on whether you can handle incessant loud meowing
3) Depends on whether you can handle spiteful damage to your property1) None.
2) The cats only live with me because when they were strays they miaowed so loudly that no one could bear it anymore. They have destroyed the sound insulation around the door.
3) See above. On the plus side, there's not all that much left to destroy in the house.
1) Depends on whether you have a downstairs or not
2) Depends on whether you can handle incessant loud meowing
3) Depends on whether you can handle spiteful damage to your property