UCL masters student in search of double room

Hi, I'm going to be studying my masters at UCL starting in September. I'm American but familiar with life in London after living there and attending QMUL for a year. I'm a serious student and I am very clean and respectful of other people's space. My budget is up to 650 pounds per month (bills must be included in that number) and my preference would be for a double room. The room has to be furnished.

I am not currently in London, but I will send my boyfriend to take a look at the flat and I am available to video chat so that we can get to know each other. I will return to London on September 18th, so I would prefer a flat which is available sometime between mid-Septemeber and the mid-October.