I stayed in the Marriott Crystal City for 2 nights at the beginning of May. The hotel was fairly full due to a conference, but you would not think it. The welcome at reception and check in was prompt and courteous - they opened a new desk and greeted with a smile which is often rare!
my room was lovely - it was clean and spacious and the bathroom was spotless.
I at in the hotel on both nights. The first night I ate in the bar and was greeted pleasantly and I was served promptly. I elected to eat at the bar and the food was smashing. I was rather overwhelmed at the portion size (huge!) but the food was very tasty and with free top-ups of my soda, I was most comfortable : )
The 2nd night, I ate in the restaurant. The food was delicious and again the portions rather large! It was a much more formal environment, but it was still comfortable. the staff were attentive without being overbearing so this was good.
The hotel was located really well. I came off the tube and it was easily spotted and a quick 2 minute walk brought me to the front door. The hotel also had a direct tunnel linking it to the Crystal City shopping mall which was great.
the only thing I didn't test was the leisure centre and pool. Given the standards of the rest of the property, I can only hope this is of the same standard though I cannot say myself.