It really depends what you want to see and do. Beijing has been massively gentrified over the last 5-10 years and everywhere is much of a muchness. The Renaissance you're looking at is in ShuangJing I believe which is quite popular with foreigners to live but there's really nothing to do there. I'd maybe look at the Renaissance Wangfujing or somewhere central like that. Can walk and bike around quite easily, Hutongs to the north and Tiananmen etc to the south. Nice enough to do some mindless wandering. For a short stopover not much worth seeing outside of that area.

Unfortunately the gentrification has all but obliterated the Beijing street food scene. Dashilan has options but its all a bit 'if Disney did China'. Street food in general in China seems to be coming a thing of the past unfortunately. Everywhere you go they just seem to have the same chain vendors selling awful frozen squid on a stick, spam sausages in a pancake, and half raw 'BBQ' sticks cooked over an element from a kettle (Sorry for the rant!).

Are you travelling for PEK or PKX?