has stayed at the Days Inn Maingate East location in the suites that you mentioned. The link is
www.disboards.com/forums/showthread.php?s=&threadid=49804
It seems that there were not any horribly objectionable or abominable qualities at all to their room/mini kitchenette and they mentioned the overall accomodations were fine also. I recall other positive reviews about this Days Suites condition and others on many sites in the past too; one of them being
www.mouseplanet.com
Also, having driven by that particular Days Suites many times in the past and staying near the Days Inn Maingate West last summer which was neighboring the hotel I booked, the outside has looked well-maintained and very clean.
So, it is a mystery to me since I have read pleasant reviews about guests stay/individual rooms at those and had a chance to at least somewhat view these hotels from the street, that there would be a definite boldly posted warning to stay away from all Days Inn in Orlando on that site too. Go figure?
I think one of the main differences between the Kissimmee/Lake Buena Vista is that WDW is located within the confines of what actually constitutes Lake Buena Vista...ie ground zero and Kissimmee is an intensely close bordering entity.
Another thing I believe is that generally in Kissimmee, you will be able to find a lot more economical and greater variety of accomodation selections along with many kinds of restaurants/grocery stores/shops/etc. in more of a wider range of prices for all tourists.
But, as far as location goes, the Kissimmee area (U.S.192 and immediately surrounding) where most of the advertised hotels, rental homes, villas, condos, suites, and resorts that cater to vacationers happen to be situated are literally right next door as far as proximity to WDW and are just a 5-10 min. distance from the parks.
We have stayed in this area for some time now and always find it to be very convenient in getting around and extremely nice also. Hope this helps; have a great vacation.