Some college friends and I rented John & Cynthia's place this past weekend for a reunion weekend, and we were very pleased with it. Besides the fantastic location (walkable to many great shops and restaurants and sitting on the Katy Trail), John could not have been more helpful in all our interactions. He was always very friendly and very quick to respond to any questions or issues we had.
The only issues we had were (1) initially our key code to get in didn't work and it was pretty late at night -- but John quickly resolved it and we got in with a new code, and (2) the button lock/door handle on the back door was finicky -- sometimes we could get the door open and sometimes we couldn't.
Otherwise, the place was very clean and well kept. I would definitely recommend this place and renting from John & Cynthia.