Budget-friendly hotels in Belfast, London, Reykjavik, Reykjanes Peninsula, Torshavn, Oslo, Stockholm, Helsinki, Tallinn, Copenhagen, Dublin under $100 a night

In Belfast, expect budget-friendly hostels and guesthouses that offer shared accommodations and communal kitchens, perfect for meeting fellow travelers. London has a variety of affordable hostels and budget hotels, often located near public transport, making it easy to explore the city's iconic landmarks.