Solo Europe trip (June–July) – loose plan, train-heavy. What would you tweak + what’s actually fun to do travelling by myself?

Hey guys, Planning my first proper solo trip across Europe around my visit to sister's place in Utrecht , Nehterlans.. Roughly 6–7 weeks. Not trying to over-plan everything, just setting a loose route and figuring things out on the go.

Rough route:

Netherlands (Utrecht/Amsterdam/Rotterdam) → Belgium/ Luxembourg/North France from my sisters place

Bonn (visiting a friend)/Frankfurt → Prague → Budapest → Vienna

reach Stockholm. ferry to → Helsinki (an architecture tour in Finland)

Anchor points

Trying to mostly use trains, avoid too many flights, and keep it flexible. Mix of hostels + occasional comfortable stays.

Need some real-world inputs:

1. Route sanity check

Does this flow make sense or am I doing something obviously inefficient?

1. Too many cities?

Prague, Budapest, Vienna — keep all 3 or cut one?

1. Train is a good idea? Especially Vienna → Stockholm.

2. Staying central but not broke

Any solid areas to stay in:

Prague / Budapest / Vienna / Stockholm

More importantly:

If you’ve done solo travel in Europe — what actually makes it good?

Not generic sightseeing.

Things that are genuinely better alone

Experiences that don’t feel awkward solo

Places/activities where being solo is actually an advantage.

Not looking for a packed checklist. Just trying to avoid dumb mistakes and make the trip feel less like ticking boxes and more like a solid solo experience. Also looking to have a different perspective to life / work (i am an architect) etc.