Nice one indeed. And that's the key point about the free night award, use it somewhere nice like a Sofitel or alternatively use it for a booking where there is no way you would otherwise get a cheap hotel (i.e. last minute booking at high demand location). Last year I used my award at the Novotel Sydney International Airport for a last minute booking, I saved ~$200 but am sure I could've got better value elsewhere.
This is correct, and often times the difference can be minor (i.e. tens maybe $100 depending on property). This would actually be a perfect question for the thread
Check Accor Plus free night availability, since they could tell you whether you could use a free night on your desired date and what the price differential is for the suite.
Another option of course, is to book the base room and roll the dice that you receive an upgrade offer to the suite later on (usually those land a couple days before check-in). It is my understanding that Accor properties won't upgrade elites to suites unless of course you are using a suite night upgrade coupon (but those cannot be combined with the free night award as of yet) so the best you could get as an elite is an upgrade to the highest level non-suite room (i.e. Superior or Deluxe). With that being said, one hotel I stayed at last year, the ibis styles Hobart did do a complimentary upgrade to a suite, so YMMV.
One key thing to watch out with the free night award is that it cannot be used at every property on all dates. To give you an example, I was looking at using my free night award at the Sofitel Darling Harbour in September and on the dates I wanted it was showing up as unavailable to apply the free night award. However, when I looked at the first weekend in February that was perfectly fine. You'll know if you can apply the free night award since the price will say Free. If it doesn't say free then chances are it's unavailable.
-RooFlyer88