Stayed here for 4 nights on a business trip. Rooms were modern and comfortable, but I found the bed to be softer than I like. A colleague and I tried the restaurant in the evening at it was a major disappointment. The 3 main issues were 1. Food was bland and lacked any flavour, 2. Small portions and 3. Expensive.
Also, the hotel doesn't have a gym, but you can use the facilities at "Hertfordshire Sport Centre". Don't be fooled by the name, it's basically the Gym on the Uni campus.
Overall, I'd recommend a stay here but don;t eat at the restaurant. There's a mall across the road and has a load of restaurants to choose from.More