Help - our new cat is not adjusting to us

Question:
 My fiance and I have "rescued" a coworker's cat from being sent to a shelter (his previous owner had a new baby and he wasn't getting much attention so he began peeing on paper and bags left on the floor) but he doesn't seem to be taking to his new home (or us)well at all. We are keeping him in the second bedroom by himself for now. When we come in he either hides under the bed or growls and hisses at us. Strangely though, sometimes when he's under the bed, he'll stretch out, yawn and act all relaxed - and look cute as can be. Sometimes if we spend time in the room just sitting, he'll come out and act like he wants to come over, then when we offer a hand to sniff will hisse and walk away. His previous owner said he liked tuna fish so we're trying bribery. He's eating and drinking and using the cat litter, but won't accept treats from us when we're in the room. Does anyone have advice for us? Will he eventually get used to us and like us? Is there something more we could do to speed this process or ease his adjustment? He's supposed to be a social cat, according to my coworker, and when we picked him up at his old place he came right to us. Thanks.
Answer:
 Hello, I think I can help here. It seems your new kitty has been pretty much thrust into a new home with people he doesn't know very well. Sure, when he's in familiar surroundings, he's nice and friendly, which is probably why he takes to the second bedroom so well. Just give him a little time, and don't actually shut him in the second bedroom. Cats don't do very good with change, so he just needs some time to get used to his new situation. When we moved to our new place, Bear, our little cat man, was hiding in the bathroom cabinet for a long time before he finally came out to explore. Now he practically rules the place, but, then, he is a cat. Just give him time, let him get used to your presence, and make sure he sees that you're the one offering food and water, and, sooner or later, he'll get used to you both.
Answer:
 i had a similar problem with my cat waldo (which is why he was named waldo, because he was always hiding from us, and it was like "where's waldo?" in our townhouse). i would definately recommend letting the cat out of the bedroom. cat's have to investigate their new surroundings in order to feel comfortable. it took my cat, waldo a solid 2 weeks for him to come around. he had to investigate every nook and cranny first i think to assess his threat level and determine his risks. then, once he got used to his environment, he started to get used to us. he is now an extremely affectionate cat. something you might want to consider though, is taking the cat to the vet to see if he is sick. when waldo got sick he did very much the same thing that you are describing. he hid under the bed, would not come out and hissed if we got too close to him.