Excellent option for staying nearly on the Strip. Signature is located to the side and slightly behind the MGM. The indoor walkway takes about 10 mins to the MGM pool (best place ever). The room is super clean and the view is great (looks toward Cosmo). Fridge/Stove/Micro/etc. There is no charge for parking and it is underground (out of the Vegas sun). They do put a $200 hold on a credit card so be prepared for that.
Would 100% stay here again. Pro tip- bring a donut shaped raft for MGM lazy river. They cost $26 to buy them there. Also, eat at Fiamma for an amazing Italian dinner (which you can bill back to that $200 hold :))