These flats can be a nightmare to sell and it's why I would never buy one (nor my parents).
The people who build them make their money on the service charges. They keep building more and more developments and everyone wants the new shiny modern apartments.
Being blunt, even at the price the apartment looks, cold, shabby and outdated.
Worse the fact it's empty and unfurnished is a sign the previous owner has passed on, which isn't exactly a ringing endorsement to further buyers who will not want to be confronted with their own mortality.
Realistically you need to do two things.
Firstly you need to update the property. Don't need to go mad, but remove the sofa of sadness and bed of boredom.
Paint the walls and the kitchen units. Get rid of the fridge freezer as it makes the kitchen look too small and ideally put in a modern induction hob. Put a nice tap on the sink.
Freshen up the bathroom taps, get rid of the shower curtain and mustard towel. Consider painting the tiles.
Get rid of the outdated wardrobe in the bedroom or at least update it in some way.
Good news is the carpets look fine and the exterior of the development looks nice.
Then when you've done that, update all the photos and market it as refurbished and put it back on the market at a realistic price compared to other options. I don't just mean on the same development, but other shiny new ones in the local area.
Upshot is it's not an asset and you need to sell asap.