Oslo has Europe's No. 1 metro, analysis of travel reviews shows

Underground or metro rail systems are arguably indispensable for city residents and visitors: capitals without one, such as Dublin, are notorious for heavy traffic and long commutes.

For the best service, Europeans should look to Oslo, according to luggage storage provider Bounce, which analysed reviews posted on Google of the continent's subway systems.

Oslo's 101-stop network was highly-rated due to it being connected to the country's wider public transport system at Jernbanetorget station, which is "easy to get around" and "very well organized," according to Bounce’s explanation of the reviews.

Sofia has the second-best metro in Europe because it offers "simple and accessible experience for foreign visitors," according to Bounce, which has Athens third due to its subterranean railway system offering "direct access" to the city's airport.

Madrid and Warsaw made the top five, with Lisbon, where Bounce is headquartered, ranked 7th, a place above the world’s oldest and arguably best known metro, the vast London Underground or Tube.

The five worst metro systems in Europe are in Amsterdam, Berlin, Brussels, Budapest and Paris, according to Bounce. Budapest fared worst of all after reviewers found one of the stations on the network to be "a rather unpleasant place."

In Brussels, multiple reviewers described Gare du Midi, a metro stop and one of Europe's main international train stations, as "unsafe" and "dangerous."

Reviewers were similarly scathing about Gare du Nord, another major rail hub and a stop on the Paris underground, with travellers warned by Bounce to "be wary of pickpockets."