The couple estimate their chosen method of travel has saved them around $18,000.
After falling in love in 2015, the couple decided they wanted to see the world together from their base in Buenos Aires.
However, after travelling through South and Central America, their bank balance began to show strain and they looked at other ways to make money.
Ben, who funds travel costs by working for an online language company, explains: "We met in 2015 and wanted to travel the world, but we were self-funded and after six months we began looking at house-sitting.
"19 house-sits later and we're still in contact with all of the families we've stayed with.
"It's a great way to travel without feeling like a tourist, we can be dealing with everyone from the gardener to the cleaner and end up feeling like part of the community."
After working out that an annual subscription to the house-sitting site cost about the same as a one-night stay in New York, they took the plunge and created a portfolio that would sell them to potential property owners.
On their first house-sit, they struck property gold in the Big Apple, staying in a "huge" apartment in the city.
Says Ben: "Our first trip to Manhattan, we lucked out, it was three blocks from Central Park with the biggest terrace I have ever seen. We had to pinch ourselves that it was actually real."
But five-star palatial homes aren't always a given: 'Homes are comfortable, so even though they're luxurious, they're still someone's home - they're lived in.'
He says the biggest mod cons they've come across is swish kitchenware, which seem to be a given in the homes of the well-heeled.
Ben jokes: "We've learned how to use a lot of induction hobs!"
And their best house-sit to date? Falling head over heels for a yellow labrador called Eddie while staying at a house in Rathcoole, on the emerald outskirts of Dublin.
Ben explains: "It was unexpected, we had dinner with the family the night before they were going to their son's wedding in Peru and just really enjoyed our stay.
"Eddie the yellow lab was really old, and after three weeks of caring for him it was really hard to leave."
The couple say they plan to keep travelling until September when they'll settle in Germany, where Mariano is planning to study.
Another trip no travel agent could conjure up was to Mullsjö in Sweden.
"There was almost a metre of snow when we arrived and such a cute lady, a Brit who'd lived in Sweden for 20 years, greeted us at the train station.
"We looked after her dog and cat and she trusted us to decorate her home for Christmas and we had great fun doing it."
The pair have since travelled east across the world with the house-sitting company, which was founded in 2010, including Vietnam, Indonesia, the US and across Europe and plan to keep going until summer's end - and as often as they can from then on.
'We'll keep doing it after that; if we need a weekend away or some time alone. It's a fantastic way to see the world without feeling like a tourist'
Ben added of their adventure: "Every single house-sit was a unique and humbling experience that enabled us to share in the lives of amazing people and pets who we are lucky to now call friends. It was thanks to TrustedHousesitters that we have been able to connect with so many people and visit so many places on such an intimate level - all the while saving a lot of money.
"We've saved somewhere around probably $18,000 by travelling the world like this and gained so many unforgettable memories along the way."
