What a fabulous location! And a lovely house actually, fantastic sized rooms.
My first thoughts are that the front garden area looks a bit unloved. Can you replace some of the tatty window boxes and put some bright flowers in? If you could replace/paint the fence too, I think it would look altogether tidier. At the moment it sort of screams 'the front garden is really difficult to look after'.
Also the bathroom picture is a bit depressing. Pop some warm-coloured towels over the rusty towel rail, a posh-looking bottle of hand soap on the sink (TK Maxx or somewhere is good), get a new shower curtain, and if you have the budget for it, replace the floor and side panel of the bath - should cost no more than £100-£150 in total.
Kitchen is lovely but a big vase of flowers on the table would be nice. Also try and unplug whatever it is on top of the cupboard which is hanging down over the cooker - looks a bit dangerous!
I'd get rid of as many bookcases as possible throughout, as they tend to make a room look smaller than it is, especially when there's more than one in a room. The lounge would look brighter and airier without the two shelves around the sofa, as it is it looks a little cramped for space.
Most of the houses in your area in that price bracket have much 'trendier' interiors - not necessarily minimalist, expensive or even particularly tidy, but they have an edgier kind of vibe. This one, for example, which has small rooms but a lovely feel about it from the photos.