Being alone might be best, but it isn't fully required. The key is that there can't be any sort of mess. leaving something on the ground would cause Devin to trip over it as people rarely use their cane or assistance when in their own home. They are able to memorize the furniture and other things. even keeping desks in specific layouts is required for them to be able to us it regularly. Devin and his family would likely have asked that he have his own room since blind people are very much aware of how difficult this can be as most people even neat people aren't completely able to keep a place as neat as it needs to be.