I have stayed at a fair few Premier Inn hotels all over the country, usually just for one or two nights.
They are well located for access to city and town centres, and normally have their own free parking available (although some hotels, like the ones in parts of London) have a car park close by, but you have to pay.
The rooms are very simple, but effective, with all of the amenities that you need - tea/coffee/biscuits, telly, hairdryer, etc. Decor is again quite basic but you are not going to spend hours and hours in the room, so it doesn't really matter what is on the walls!
Never found any of them that were dirty - always clean and well turned out. Very friendly staff who are always willing to help (and I am always wanting extra pillows and tea!!) Everything has always been in good working order as well, no problems with remote controls or heating.
They have sales on from time to time, which, if you register on their website, you will get an email to tell you when they are coming up. Rooms usually start from £29 a night, which is a bargain for two people staying overnight! There is usually a breakfast option which is extra, but that can be pricey at about £7 per person. Although, we have found that they are normally next to a McDonalds or something similar, so we tend to have our breakfast there.