Should we use a Eurail pass?

Only if you plan on being very spontaneous. If you know your dates and cities, buying point-to-point tickets in advance is almost always cheaper.

How do we handle disagreements on what to see?

Each person gets 'veto power' for one activity per city, and you must schedule at least two hours of 'solo time' or downtime each day to recharge.

Planning a Multi-Country Europe Trip as a Couple

Focus on a maximum of three countries over two weeks to avoid spending your entire trip in transit. Use high-speed rail to connect major cities and book your inter-city travel at least six weeks in advance to secure the lowest prices.

Select your 'anchor' cities. Pick two or three major cities as your base. Don't try to see all of Europe in one go. If you have 14 days, spend 4 days in each base city and use the remaining days for travel time and buffer.
Map your transport links. Use the Omio or Trainline app to check if your chosen cities are connected by direct high-speed trains. If travel time exceeds 5 hours, look for a budget airline flight, but remember to account for airport transit and luggage fees.
Divide the planning workload. To prevent 'trip burnout,' assign one partner to lead on accommodation booking and the other to lead on activity research and restaurant reservations. Meet once a week to sync your findings.
Establish a joint budget account. Set up a shared expense tracking app like Splitwise or use a joint travel card (like Revolut or Wise). Agree on a fixed daily 'fun money' limit for dinners and spontaneous activities before you leave.

Should we use a Eurail pass?: Only if you plan on being very spontaneous. If you know your dates and cities, buying point-to-point tickets in advance is almost always cheaper.
How do we handle disagreements on what to see?: Each person gets 'veto power' for one activity per city, and you must schedule at least two hours of 'solo time' or downtime each day to recharge.