I like the house. At first glance I thought oh this is a quick fix! Just do a nice gravel or breedon type driveway and it would look completely different.
But as I went through I think the issue is the bedrooms. It’s not a 4 bed, it’s a 3 bed and that’s generous as really it’s one and two halves.
And the railway will put some people off. It’s a tricky one as not sure doing the driveway would be a lost cause.
If your serious about getting max price for it I would speak to an architect and planners and see what extensions you can get. Draw up plans and get permissions to turn it into a proper 3 or 4 bed and whilst doing that you can address the back of the house as well because I do think that view lets it down. Would look fine rendered but you could maybe do plans for some lovely glazing modern back to make the most of that fabulous garden.