Hola algo no funciona por aquí 
<br />
<b>Notice</b>:  Undefined variable: conector in <b>/home/casas/public_html/web2.php</b> on line <b>4</b><br />
<br />
<b>Fatal error</b>:  Uncaught Error: Call to a member function prepare() on null in /home/casas/public_html/web2.php:4
Stack trace:
#0 /home/casas/public_html/alajuela/venta-de-casas-atenas-esta-es-una-ganga-790105.php(1): include()
#1 {main}
  thrown in <b>/home/casas/public_html/web2.php</b> on line <b>4</b><br />