The Houstonian Hotel definitely has a resort-style feel to it. I stayed for 2 nights and felt more time was needed to fully explore the entire venue. I read that the fitness center is one of the largest in the world... and they were not lying. If you're into fitness and sports, you'll appreciate the Houstonian Club and Spa. Multiple pools (including lap pools), indoor and outdoor tennis courts, even an indoor climbing center. Name it, you have it. The actual gym has everything you need for your typical workout. I like that there is a cafe where you can have breakfast or a protein shake after your workout.
The rooms of the hotel are clean, spacious, fully equipped with a large flat screen TV (large variety of channels including HBO) and very comfy beds. The service provided by the personnel is of high quality.
I had breakfast at the Olivette and was really impressed by the food and fast service. The Fritatta was absolutely delicious. The prices are very reasonable for the big portions they offer.
My only critique is the fact they charge 15$ for self parking. If you are able to afford staying at the Houstonian, 15$ is nothing in comparison. Still, I like to have a free parking option wherever I go to.
Overall, I thoroughly enjoyed my experience at the Houstonian and I would highly recommend anyone visiting Houston for a short period of time to stay there (especially fitness enthusiasts).