Please don't think the Swindon Hilton is a wonderful hotel - don't be disappointed - it isn't ! It is convenient for the M4 being only a few yards from J16 but it really isn't a luxury hotel - the De Vere is better.
The Magic Roundabout is a logical traffic system that daunts many, but is extremely easy to navigate - just look for the road you want and head for it using the shortest route.