oh really? Im trying to find something with some culture and safe. but i don't want to break the bank either.
London is full of culture, so you don't need to worry about that. It's also relatively safe - of course, it's a large city and there are areas you will want to avoid, but overall, I don't think you will have much trouble finding somewhere safe.
The main issue is going to be cost of renting somewhere and the cost of living in general. If you're willing to share a flat or a house with someone else (or a few people), you'll probably be able to find something within your budget.
Does the £900 pcm include utilities (council tax, electricity/gas/water, TV, phone, internet etc.), or are you budgeting extra for those? You'll probably find that a lot rental agreements will only include the rent and not any utilities.
Salaries in the UK are generally much lower that in the US, but living in the UK can be a lot more expensive than the US (and the south of the UK is more expensive than the north). Not everything is more - things like certain groceries, cell phone contracts and broadband/cable TV contracts are usually cheaper, but pretty much everything else is more expensive.
London in particular is even more expensive than the rest of the UK. In fact, I believe it's currently ranked as the most expensive city in the WORLD to live in.
I see on your posts that you're currently in Portland, OR - there's a website that does a 'cost of living' comparison between two different cities. To give you an idea of the differences, the comparison between Portland and London is here:
http://www.numbeo.com/cost-of-living/compare_cities.jsp?country1=United+States&city1=Portland%2C+OR&country2=United+Kingdom&city2=LondonAs a comparison of how rental prices can differ between cities in the UK:
I live in the small city of Lincoln (about 120,000 people) about 120 miles north of London (Eastern England). Last year, I was renting a 2-storey, 2-bedroom, end-of-terrace house with a parking space, front garden and back garden for £450 per month (not including utilities).
I grew up near Bristol (about 440,000 people), 120 miles west of London (SW England) and a similar 2-bed terraced house there would cost me about £750 per month (not including utilities).
In comparison, a similar 2-storey, 2-bedroom house in Acton, Whitechapel or Kingston looks like it would set me back around £1,400 per month, but in Camden area, it seems to be more like £2,000-3,000!