Service was outstanding...dont let decor get in the way.
Like everyone has posted, the physical structure and dated looks of the building inside and out is very obvious. That said, the staff was one of the most outstanding crew I have ever encountered in a hotel. Wonderful service all around. Super nice caring people...Four Seasons all the way.
Very low key hotel. The outside pool and bar area is very nice. Great service here too. Check in and out was a breeze. Valet guys exceptional. Housekeeping fantastic, breakfast was excellent. The hotel is close to many things in downtown and wonderful hidden gems of the locals. The spa was booked but they sent me to the Hilton 2 blocks away and I had a great massage. The Hilton is gorgeous inside, brand new...I do not know if their service was as top notch as the Four Seasons but their Spa staff was great. 
Do not let the outdated looks of the hotel stop you from staying here. I am sure they will update soon.
This was our first time in Houston and both my husband and I agreed that this city has the nicest people we have ever met. We will be back.