A very well presented house in a very popular area!
Walkely is one of the more popular areas in Sheffield and with that property values are naturally higher, as are rents.

Walkely is only a short drive into the city centre and within walking distance of the university, so does attract both student and professional tenants. Because of the increased demand this does contribute to higher rents.
A property of this size and quality in Walkley would comfortably rent for £625pcm, meaning that if purchased at asking price the yield would be approximately 5.4%. This an average yield, but certainly has the potential to increase given the popularity of properties in Walkley.
This property will also attract a lot of interest from first time buyers, so £140,000 does seem a reasonable asking price and I feel this property will sell quickly at this price.