Stayed here for a couple of nights for a recent event, and couldn't believe how close it was to the convention centre - you can literally get out of bed 5 minutes before and cross the road to the convention centre!
Staff were very friendly and helpful, and check-in / out was effortless. Food was typical Premier Inn - the sausages at breakfast really are the best at Premier Inns.
The only criticism I'd have is that the car park is the NCP under the MCCC - a 5/10 minute walk and pretty expensive, although the Premier Inn do give you a small discount voucher for this. Other than that, you'd be mental to book anywhere else if you're visiting Manchester conference centre.More