Yes Families First is a booking agency much like Homes4UU and so on. I booked through them and had no problems. Well one problem but it was not their fault.
I arrived rather late in Kississme after their regular hours so I had to pick up my Package and keys from the answering service. Due to heavy traffic on 192 and construction it took close to 45 minutes to get from the office to our home. We had requested a 3 bedroom home, much to our surprise the home we got was a 4 bedroom, beautiful home. The only problem is once we got there I realized the girl at the service had given us someone elses package and keys. Luckily we had not brought all our stuff in so we headed back to the office. They were very apologetic but after being on the road since 6 AM and it was now midnite I was less than happy. They gave us our new package and keys and out we headed. This house was even further than the one we had just come from.
Well we got to our house and discovered I guess that they had no 3 bedroom houses left...This house was a 5 bedroon house, 4 bathrooms, pool, two car garage, it was beautiful..

Everyone had their own room and bathroom, the kids thought this was great. There was no extra charge for the upgrade. We enjoyed the home so much we actually phoned and asked to stay an extra day, this was done with no hassles. We did have a couple of small problems, plugged toilet, they forgot to turn on pool heat, but all these problems were taken care of promptly and the necessary adjustments made to our bill.
We also enjoyed returning to "our" home in the afternoon and swimming in our private pool and having snacks on the patio and then returning refreshed to the parks. Our drive depending on traffic to the parks was around 15 to 30 minutes. For us the vacation rental homes our the way to go, but that isn't to say we will never stay on site again, in fact one time we split between on site at POR and the house.
So if you are thinking of Vacation homes, this may be the way for you to go.