Our nearly week long stay at David's studio was wonderful! Columbia City may not immediately be in the typical Seattle destination neighborhoods, but that didn't matter as it was a easy drive to nearly anywhere we wanted to go. An Uber to Safeco was very short as well.
Columbia City itself has plenty of nice restaurants and Safeway is just at the bottom of the hill from the unit. Both Ways Cafe is recommended and is a pleasant walk away and strolling along the waters of Lake Washington is a wonderful way to spend a morning.
The space itself has all the necessary amenities and was very comfortable for two people--the gas fireplace really kept us cold Floridians toasty the whole time as well! A nice TV with an Apple TV was a really smart move, since most people can access numerous streaming options for nights in. The patio has a very pleasant ambiance as well--David's landscaping, like much of Seattle, was very diverse and beautiful.
I'd absolutely stay in the space again when I return to Seattle.