Not sure whether the Kings Arms is a Hotel with Bar and Restaurant or a Bar/Restaurant wih rooms. Whichever - it's a very pleasant place to stay in and eat at while in Christchurch.
Situated in the nicest part of the town, opposite the ruins of the abbey and by a nice river walk down to the quay. My room was the largest available and was very well appointed. Lots of space, fridge, safe, full tea/coffee making facilities, nice bathroom, etc. Breakfasts were excellent, almost anything you could want was either laid out on the bar or available from the menu. I had one dinner there and it was delicious.
Staff all friendly and helpful.
Minor niggles: Freeview reception would cut out for minutes at a time, muzak from the bar seeped into my room (but was turned down in the evening when requested), not really a dedicated reception - more an extesion of the bar, church bells ringing the hours and quarter hours (I found it comforting but others might not!!!), overhead shower took many minutes to get hot (although bath and sink would come through hot immediately????). Minor issues.
Would defintely stay there again or eat there if in town.