No metro near. Nearest cercanias station (and next year also metrosur station) is Alcorcon, from there you must walk about 15 min to get there, passing over the train and N-V. But many people goes walking from there or even farther, despite accesses are not very good.
There are bus stops in front of the center, with buses from madrid and alcorcon, both are lines to Villaviciosa de Odon http://www.empresadeblasycia.es
The center have two areas, amusement area is just cinemas and a bowling, plus some restaurants.
In the shopping area are dozen of clothing shops, some more of furniture and decoration and a Supercor (food supermarket of El Corte Ingles). There are also C&A, H&M, Cortefiel, all Inditex shops. No Carrefour or Alcampo as there is an Hipercor and an Alcampo already in Alcorcon.
It's good because of variety of shops. Not so good the amusement area.
If you go by bus or car try to avoid saturdays, accesess are as good or bad as they were before the commercial center opened(blame on Alcorcon council). In that case is better to go walking.
A couple of pictures and description: http://www.bdp.co.uk/news/2002/a0210_tresaguas.asp