title: WP->Query get Custom Post ID from meta_value & meta_key
body: <p>I have been trying for a couple of hours to make this work - but for some reason its simply to difficult for me. I have a custom post_type 'house', and I want to find the post_id of my custom post_type with a meta_key and certain meta value.</p>
  
  <p>Lets say i want to find post_id for a house with
  meta_key='house_id'
  meta_value='231sd1223'</p>
  
  <p>How exactly would i do that with wp->query?</p>