I stayed in a private room that was minimal but acceptable -- bare wooden floors, thin foam mattress -- but with an air conditioner that really cranked. (Houston is hot pretty much all the time.) Location is great, in an older 'hood just a few blocks from the glittering downtown and a 30-min walk (20 the way I walk) to Minute Maid Park. A few street people about, but it didn't feel dangerous to me.
Free breakfast and coffee in the mornings! Hard to beat.
The couple who run the hostel are quite warm and inviting. The man, Danny I believe, planted himself in the street one morning and did tai chi with swords -- bare-chested -- more weird than interesting ... then tried to get me to sign up for classes. No thanks!
Overall, excellent value for your money, even more so in the dorm.