Igs can be finicky. They need lots of space, but you still need to maintain high humidity, provide UV for basking and the correct temps for thermal regulation. They plow through fresh greens and veggies every day, and they poop like Saint Bernards. They're big, some of them will always have an attitude, and their claws, tails and teeth can do enough damage to land you in an emergency room.
That said, they're intelligent, come with stand out personalities, get attached to and form bonds with their handlers, and are a really engaging animal to keep. If you're up for the challenge, go for it. Since it's a rescue, absolutely make sure you have a god herp vet on hand and get the baby checked out. also do a thorough inspection of all the equipment. I can not even count the amount of times I've seen people trying to give away reptiles "with all the equipment" when the equipment amounted to too small caging, some branches, and a heat rock.