The old adage “If it seems too good to be true, it probably is” doesn’t apply to a stunningly cheap apartment in Midtown  Manhattan . An $857-a-month one-bedroom apartment in a  luxury building  where similar units start at $4,725 will go to the lucky winner of a  New York  City affordable  housing lottery . The building, The Landon , is in the trendy Hell’s Kitchen neighborhood. Amenities include a modern fitness center with a group class space, children’s play area, residents’ lounge, and a “