I found this website where accommodation in the Docklands area looks reasonable.
How's the Docklands area?? Mainly residential? Is it rowdy?
And is rental of GBP200 per apartment per week reasonable (an apartment that's suitable for 2 to 3 persons)?
The Docklands/Canary Wharf is the financial area of London and is a lot like the City in that after work ends it becomes a ghost town so to speak,so not that rowdy, but ignoring that, you are in London and its easy to get to where it is rowdy if that's what you are looking for.
There are quite a few residential highrises being build as well as many already there. If fact the place you listed I have been meaning to check out as a place to live. Also if you are paying for a flat that can host up to three people for 200 a week that isn't that bad.
For the area of canary wharf/docklands GBP200 a week is good - considering parts are some of the most well off areas in London. YOu will probably find lots of suits in the bars around the area and the prices in the pubs are generally a little bit more expensive because of this. Saying that, you find suits in every pub in London especially on a Friday night!!
Location wise is good - you have all sorts of transport including the DLR (docklands light railway) as well as the usual buses, underground connections etc to take you either further into the city or out into the 'burbs. If you do stay there definately go the Greenwich if even for the day. In nice weather a wander around the park is wicked and in typical english weather there are the museums, observatory and markets to check out!