"Granny-sitter wanted. Seeking a big-hearted soul with caring experience and a musical talent to help look after Margaret, 93, who has a love of crosswords, baking and singing old drinking songs," the advert on a website reads.
Ross Elder, 40, and his 32-year-old partner Sofie posted the ad in the hope of finding someone able to look after and give company to their grandmother three days a week in return for living rent-free in their posh city apartment overlooking the river Thames on London's Southbank.
They have received over 200 emails and are now in process of shortlisting through interviews.
"We wanted someone who would bring more life into the house and just hoped we could find someone who was looking for a place to live with some caring experience and a love for music to help keep Margaret entertained. We didn't really know what to expect but we've been really overwhelmed with the response," grandson Ross told BBC.
"She's had a really busy and active life but two years ago she had a stroke and when we realised she couldn't live independently any more we had to move her into a care home," the internet entrepreneur said.
"I felt I wanted to do something more and so we decided to look at moving her in with us," Ross said.
"We decided to rent a place overlooking the river that was much better for nearby walks and getting around. We organised some professional care as we realised it would be a challenge but I wanted someone to be with her all the time. She has occasional memory loss and mild dementia and she needs someone to always be around," he added.
The idea for a live-in granny-sitter came after they read about a nursing home in the Netherlands which allows university students to live rent-free alongside the elderly residents, as part of a project aimed at warding off the negative effects of aging.