Great location, great view from the balcony. The room was nice; a large studio with a bed & pull-out couch (which no one had any complaints about). The bathroom is large, the shower is roomy, and there is a jacuzzi tub. It had a separate water closet for the toilet. The room also has a small kitchen with stovetop, refrigerator, and dishes/cookware available by request from the front desk.
The MGM Signature is connected to MGM Grand via moving sidewalk, but if you're going to the main strip, it's better to leave via the main gate at Signature so you don't walk backwards (we figured this out after several trips the other way).
Overall very nice accommodations and I would stay here again.