Well, ultimately the problem is that your ex doesn't want to sell and is sabotaging the process.
Bedroom 4 is literally TOO SMALL to legally call a bedroom. The measurements have it as 2.27x2.14 meters, which is less than 5 square metres. A bedroom legally needs to be 6.5 square metres for a single.
The playroom is awkwardly accessed for a bedroom - you have to go through first the kitchen, then the utility. Back through the utility to get to the loo in the night, and upstairs for the bathroom.
Photos are awful and make ALL the rooms look poky, even the ones which are a reasonable size.
Sadly it looks much less inviting than when you bought it - both indoor decor and the garden. (Although I love the bookcase wallpaper in the pink girl's bedroom and one of the bathrooms.) The previous sellers had a good idea getting a pic of the horse in the field to the rear.
And given all the above, it's overpriced, hence no one wanting to view.