There is no single best founder burnout coach in Europe. There is the right coach for your type of burnout, and most founders pick the wrong type, then conclude coaching doesn't work.
A founder who is operationally drowning needs a different person than one whose nervous system has collapsed, who needs a different person again than one in an identity crisis. Pick the category first. The name second.
Before you pay anyone, answer one question honestly: is my constraint psychological, operational, or biological?
Most founders assume burnout is a mindset problem and hire accordingly. Often it is not. When a VC like Balderton built one of Europe's first founder wellness programs, it gave founders blood work and sleep tracking, not just on-demand coaches. The data forced the issue. If your biology is broken, no amount of mindset coaching holds. You feel better for three weeks, then slide back.
If you are not stressed but clinically exhausted (the dread, the cynicism, the inability to feel anything about wins) a coach is not your first call. A doctor or licensed therapist is.
Coaching helps you navigate the return and build the system that prevents the next one. It does not treat the condition you may already be in. Any coach who doesn't tell you this is selling you something.