Hi there
Dubai hotel prices are going up alot !
I have a villa which I rent out short term which does well as most can't afford the high prices. It will probably be too big for your needs but you're welcome to look at it,
www.arabelladubai.com
I'd recommed something like the Ibis which is cheap and cheerful, rooms are approx dhs 400, or £70 per night.
If you hear of anything else you would like an opinion on, just ask, we've lived here 11 years so we know most places!