Tknika is in Rentería. Tap the map or the "Get directions" button to see the exact location and the route from your position.
Yes, Tknika's official website is tknika.eus. You'll find the direct link in the "Website" section of this listing.
On this listing you can see "Other schools nearby" right below, sorted by proximity. You can also open the full schools in Rentería page for the complete map ranked by distance from your location.