I did 3 weeks rotary PPL there 2 years ago, it was a bit unprofessional, in my opinion, but I went back about 6 months ago for a one-off and they seem to have cleaned up their act a lot.
It's a bit intense - you can help relieve the pressure if you get some, or all, of the exams out of the way before you go, else you just fly & study with little time for any socialising and your family will hate you. If you're only flying you can probably spend more time with your other half doing stuff. Exams + PPL 40 hours in 2 weeks is pretty much impossible from scratch. I got exams + 42 hours in 3 weeks but the constant pressure meant (for me) that I think about half the lessons were wasted because I hadn't absorbed the previous lesson before taking the next! Had to do another 30 hours in the UK to get the PPLH.
Very little to do in Kissimmee itself, but there's loads of malls and attractions within 30 minutes drive. OFT have deals with various hotels from about $15/night, but if I were you I'd get a villa in one of the (many) local communities within about 10 mins drive of the field.
Make sure you know all of their 'extras' charges - they add some per-hour fuel charges on and check on any landing fees.
All-in-all, if I had the time again, I would pay the extra and do it in a more leisurely fashion in the UK.
BW