That's maybe too late for Summer, usually we look like sh*t during a cut ("empty" muscles) and it's only once the cut is over that you look better. Regardless...
No, keto doesn't really make you lose weight much faster. Scientific research regularly finds that the difference between keto and balanced diet is negligible. What keto really does is that for some people it's easier mentally to stick to a keto diet rather than a standard diet (but for other people it is the opposite).
Of course in the first days of keto you lose a huge amount of glycogen and water, so some people might have the illusion of a fat loss because of this.
Regarding muscle loss, any diet would make you lose muscle. But keto not really more than any other (except in the very first few days, if your body finds the transition too violent), and might actually protect your muscles a bit more because it's easier to have a smoother nitrogen balance.
Regarding creatine, it might help a bit but don't expect anything obvious. The main way to keep training hard despite having low glycaemia is simply to have an iron will. Otherwise a cheat could be to have a tiny bit of sugar right before your strength training : this sugar will be eliminated very quickly and you won't have time to get kicked out of ketosis. This is not a good idea for cardio sessions, though, if your program includes fat-burning cardio.