Your guide will meet you at Exit 2 of Nijōjō-mae Station. You will be contacted in advance via WhatsApp to coordinate the exact meetup. The station exit is a 2-minute walk to Nijo Castle's main gate.
The tour concludes at the Kyoto Imperial Palace grounds. Marutamachi Station (Karasuma Line) is a short walk away and provides easy access to Kyoto Station and central Kyoto.