Re: New shelter cat
Some kitties just take awhile longer to warm up to their new surroundings. Make sure he still has access to the guest room because even though he darted under the bed in there, that is his most familiar area at this moment. He's probably overwhelmed and hiding behind the washer and dryer because of that. Is the other kitty cornering him back there? I'd put him back in the guess room for a couple days or if you do want him to explore the rest of the house, close all the doors that you can and let him roam in the hallway or main area. All new smells and rooms can be overwhelming.
I think you are doing ok, he's just going to take some time to adjust. Do you know what his life was like before you had him? He could still be trying to get over some traumatic situation too.