I haven't read all tbe most recent posts OP, but here are some more thoughts.....
Regarding having photos of every room - our last two house sales the EA has suggested not having pics of every room as you want the details to leave potential buyers wanting to view in person. A lack of pics of every room wouldn't be an issue for me.
Last three houses we sold have been quirky, character homes that we had fully restored and the last three sales attracted their fair share of tourists/nosey parkers - some actually admitted as much! The right buyer was out there each time though - pricing realistically and staging the house for sale meant we went SSTC in 10 days and 5 weeks on the most recent two occasions. In 2014 (Wilts village) we reduced the price 4 weeks in, to 10k above the lowest we'd accept (we'd found our onward purchase & didn't want to lose it) which prompted three offers, two at the lowest price we'd have taken and one at asking price. That was a very niche house - 200+ yr old stone, thatched 2500 sq ft with five beds over 3 floors, beams galore, annex, 0.3 acre garden and small windows......fronting onto a busy rural A road. One viewer remarked that it was dark - what did she expect - but we/our EA put all lamps and lights on for every viewing and we do have masses of (antique) mirrors that reflect light everywhere.
Which brings me into furniture - whilst I agree you need to show your house isn't cramped/bursting with stuff, I don't agree with the paint everything white/neutralise advice. We have shed loads of antique brown furniture and have never contemplated painting it white to achieve a sale (have sold most recently in 2007, 2011 & 2014) - in fact the buyers of the 2007 & 2011 sales wanted to buy our furniture as well as the house! I would move the kitchen table though.
I do agree it's a bit top heavy - which is obviously something you can't change. We had the opposite issue once - five receptions plus kitchen, conservatory & two shower rooms d/s with only two beds and an ensuite u/s. A family of 5 fell in love with the house and planned to utilise some of the d/s space as bedrooms. They're still there and now have 5 DC, so buyers will find a way round something if they fall in love with the house. Could you look into getting plans drawn up for a small extension/garden room to show potential purchasers what they could do?
Regarding the staircases, we have two in this house (1853, extended 1920s) and foresee it might put off future buyers with DC - maybe your ideal buyers are like us (couple in our late 40s, DC flown) or with one teenage DC - as I know that when we were selling a 6 bed house over several floors in 2007 buyers with young DC didn't like the idea of the multiple stairs and DC sleeping on different floors. Think about targeting your potential buyers.....
Parking wouldn't be an issue for us - we previously had a house with double yellows outside and rented a garage opposite - but again families with young DC may not be as keen. DS was 2 when we moved there and it was a pita coming home with shopping and a sleepy toddler when there was no parking immediately outside. We sold that to an elderly lady, even though it had 4 beds. Someone will overlook this though just as our last buyers overlooked the road - they knew that was the trade off for getting a house of that size/standard at such a good price.
Your garden looks a good size - I'd definitely want to pretty it up a bit with large planters full of Spring colour. Having inherited everything from shoulder-height brambles to exquisitely manicured lawns from our previous vendors I know how bloody expensive and time-consuming landscaping/maintaining a garden can be and IMHO buyers of the country lifestyle will want that aspirational cottage garden look. Our current garden looked a picture in the EA blurb but we weren't anticipating the overgrown mess that greeted us on viewing - turned out the house had been empty 2 years and the gardener not kept on - so we spent a fortune last year replacing dead shrubs, but you can do a lot with not much cash bringing in pots of colour you can take with you when you sell.
I get it now with your front/back house issue. Funnily enough we have a similar thing going on here (see pics) where our front door is actually at the pretty side back where the garden is and the side that fronts onto the lane is fugly! Again it's a marmite thing - and some people just don't get it - but yours is a lovely looking building and the person that falls in love with your house is not going to give a flying fig whether the front door is at the front or not 