Holidu has raised €40 million in Series C funding - the highest ever amount of investment for a private accommodation search engine.
The Germany-based brand brought in a Series A of €5 million and an undisclosed Series B in 2016 and 2018 respectively.
The round eclipses the $20 million brought in by HomeToGo in April 2016 and its estimated $30 million late last year, alongside the $35 million for the ill-fated Tripping, also in 2016.
Holidu says the new round will be used for product development, opening "multiple" regional offices and expand its existing Bookiply software platform.
Subscribe to our newsletter below
The round was led by Prime Ventures, with Coparion and MairDuMont Ventures also participating.
Previous investors have also invested, including EQT Ventures, Venture Stars and Senovo.
The consumer-facing business is operational in 21 markets and, it claims, serves more than ten million visitors online each month.
Inventory is brought in from the usual suspects of Airbnb, Booking.com and Vrbo, alongside other collections of private accommodation.
Completing the circle, the company says it developed a distribution platform known as Bookiply so that property owners can distribute to online travel agencies, as well as handling bookings and property management tools via a mobile app.
Around 5,000 properties are currently using the Bookiply service, it says.
Michael Siebers, chief technology officer and co-founder of Holidu, says: "We believe in the power of technology and data and that by connecting these two, almost any problem can be solved.
"The vacation rental market is still ten years behind other digital markets so the opportunity is huge."
Despite Siebers optimism, private accommodation metasearch has had a chequered history to-date.
Tripping, one of the high-profile brands to emerge this decade, found itself facing a number of investor-related issues around 12-18 months ago.
The assets of the company, which was created by Jen O'Neal and Jeff Manheimer in 2010, were bought by HomeToGo in December 2018.