The apart-hotel, part of Skene House Hotel Suites, has retained its pre-eminence among the city's 66 hotels thanks to the stream of glowing reviews posted by guests on the global travel website.
Charles Skene, chairman of the Skene Group, said the advent of TripAdvisor had changed the business "dramatically" in the past four years.
Noting that the firm's Skene House Holburn and Skene House Rosemount also score strongly on the website, Mr Skene said: "What is happening now is that many people are looking up the TripAdvisor ratings before they go and book hotels, wherever they are. So we are very, very fortunate a sufficient [numbers] of the guests who have stayed with us have taken the trouble to write to TripAdvisor, giving us good reviews, with the result that we are high up on the list and have been number one for two years without a break.
"That means other people looking up for a place to stay see us as number one and we get a lot of bookings because of it. It is very important."
Mr Skene became one of the UK's first apart-hotel operators in the late 1970s when he seized the opportunity to develop accommodation for families moving to Aberdeen on the back of the oil boom.
Among the first to use the properties, which combine serviced apartments with hotel facilities, were John Brown, BP and Britoil, on leases of up to four years. Skene then diversified into tourism when the number of families relocating to Aberdeen began to fall.
Mr Skene, who has also developed a 162-home retirement village at Inchmarlo near Banchory, said the company's commitment to customer service has been key to its success. He noted its policy of not increasing its prices when the Offshore Europe conference comes to Aberdeen - in spite of rivals taking a different position.
Mr Skene, a visiting professor of entrepreneurship at Robert Gordon University, said: "My whole viewpoint, ever since I started in business, is the most important thing is to satisfy your customer, because the best business you can get is repeat business and recommendations from people who have stayed with you.
"We spend very little money on advertising. What we do spend money on is training staff and trying to make the customer welcome and giving them good value for money."
Mr Skene said his trade is split between oil and gas sector professionals, who stay between Monday and Thursday, and tourists who come at the weekends. He said the apart-hotel concept is growing in popularity among families because of the flexibility it offers.
Steve Harris, chief executive of VisitAberdeen, said: "Skene House Whitehall's achievement in topping the Aberdeen TripAdvisor rankings for two years is a testament to the property, their service levels and, most importantly, to the people who make it all happen."