This property in Dunstans Road, SE22 could be worth looking at.  It says it is in need of renovation and is on the market for £625,000.  Looking into a bit of history you can see that number 28 sold in June 2012 for £540,000.  I can’t say what state that property was in, but what I can say is that the market has increased 33% since then.

If we make the assumption the property sold in 2012 was in good state, then that property could be worth £718,000 now.  In terms of rent I would expect somewhere between £1800 – £2000 pcm.  I guess you won’t know unless you take a look and do some extra research.   Take a look here