Rotterdam vs Tallinn

Rotterdam

Temperate maritime climate — mild but grey. Notoriously windy (the port effect). Rain is possible any month. Summer is pleasant but brief; winter is cold and overcast.

Tallinn

Tallinn has a humid continental climate moderated by its Gulf of Finland coastline. Summers are mild and pleasantly long with up to 18 hours of daylight in June. Winters are cold, dark, and occasionally dramatic — the sea can partially freeze and the Old Town under snow is spectacular but icy. The transitional seasons are short. Northern lights are visible on clear nights from November through March.

Rotterdam

Rotterdam has an excellent RET transit network (metro, tram, bus). OV-chipkaart or contactless card for all transit. The city is also extremely cycle-friendly.

Walkability: Very walkable in the city center; Cube Houses, Markthal, and Erasmus Bridge all within easy walking distance of each other

Tallinn

Tallinn has excellent public transport covering the whole city by tram, trolleybus, and bus. Public transport is completely free for registered residents — one of only a handful of cities in the world to have made this permanent policy since 2013. Tourists pay, but fares are very cheap. The Old Town is entirely walkable. Bolt (founded in Tallinn) makes taxis among the cheapest and most transparent in Europe.

Walkability: The Old Town and adjacent districts are highly walkable on flat ground, though Toompea Hill involves a moderate climb. Cobblestones in the Old Town can be tough with luggage — rolling bags struggle. Winter icing significantly affects walkability. Overall the city is compact and pedestrian-friendly for its size.