Stayed at the HIX AMS South last week - definitely agree with the posts above...excellent HIX breakfast (like the above poster, I stay at HIXs in the US), and it really feels new. Staff is fantastic and very friendly, but didn't know that the nearby Asian place was closed on Sundays.

Two things worth noting:
1. The temperature controls in my room weren't the best -I don't know if it's a European thing (I don't think it is), but I like my room pretty cool...and the temperature was more inconsistent than anything else.
2. There's no fitness center in the hotel, or nearby (to my knowledge).

Overall, it's a VERY good HIX for the price (about 100-120 Euro), and a great use of 15K points.