(I am a professional photographer, and a significant portion of my income comes from architectural shoots for homes in this same price range.)
The advice I would give you is probably different than the advice I would give the realtor.
I think this house deserves still photos, with a pro camera and lights, for the interior. The distortion you get from a GoPro is distracting in tight interior spaces. Most of the realtors I shoot for want shots of all decent looking interior rooms, whether or not they choose to use them all in the listing.
Video walk-throughs and tours are getting to be more popular, but are usually done as an add-on and not used to replace the still photos. And, I think, would need to be done via Steadycam and higher quality video camera (e.g., dSLR or even Sony NEX) to be useful.
I think that brief video footage is best used to give the sense of what it is like to live there, as opposed to try and document the whole property. I think UAV aerial footage can be especially useful to capture the home in its environment. Flying from across the street, showing the house in the context of the neighborhood. If this house is close to the water, then the Phantom/GoPro combo can be especially useful to show that proximity, which you did do briefly at the end.
From that point of view, this shot would require two trips. Assuming that was around sunset when you shot it, you would need that light to illuminate the exterior of the house, but you would need to come back at sunrise to capture the scene from the house to the beach without having the sun blowout the lighting on the screen and silhouette the neighborhood.
