Really I think your problem is that you are trying to sell a modern two bed flat in NW10 for close to half a million using a 'sell your home for free' agent. I can't see that working well.
Oh god yeah, don't do that.
Get a proper agent in who can draw in the type of buyer you need.
I put my old Bethnal Green flat up at top top money with Sterling Ackroyd in Shoreditch/City and they worked bloody hard to get it sold at a record price for that area. Totally earned their commission.
Really I think your problem is that you are trying to sell a modern two bed flat in NW10 for close to half a million using a 'sell your home for free' agent. I can't see that working well.