Your offer should not be based on anything but what you can afford and your perceived value. Don't just offer lower b/c you think you can. Educate yourself on the market, the area, sold listings (within the last 6 months) then figure how much actual repair needs to be done - no not paint, not the tile, not personal touches - those things DO NOT affect a homes value... however, the property mechanicals (Water, Electric, Heat, Foundation, Bolier, Pipes, Roof, Walls) all matter, and any necessary and obvious repairs should be discounted from the price. Bring in an appraiser - your own - to get an idea of what is affecting the homes value. Look I am not saying that Marble tile, granite countertops don't raise the home value - but if they are green or black has no bearing on waht yo should offer. Maybe you hate marble? that's life... it should not affect your offer on the house - seriously.