This is a very unique apartment with bundles of character in a popular and trendy location.
On the lettings market, this property would appeal to a couple or a single professional. I doubt it would take long to find a tenant. I would expect this property to rent for approximately £725pcm, which means the rental yield would be just over 5.1%. This is not the best yield, however, when it comes to selling this property, I believe you could make a profit, as the market is on its way up in this area. 

The main advantage to this property is the amount of character it has in an area where a lot of apartments have very little or no character. 

A lower offer may well be considered, as this is a high price for a one bedroom apartment in the current market.
Kelham Island is up and coming and we are seeing a greater rental demand each year so rents may well be on the rise in years to come.
Not only would this property make a good investment, it looks a great place to live. The exposed brickwork and wooden beams give this property a mix of modern city living with a traditional twist.   
Most residents in Kelham Island are professionals, but I am finding more and more students are moving down to Kelham Island from the city centre.