Distortion issue in small rooms

I am photographing small rooms in Victorian forts.

The resulting image seems unrealistically distorted as a 360 and I can't find any way of 'rectifying' the image so that it is closer to normal eyesight, even squinting through one eye.

I am about to try a wide-angle attachment lens on my phone, no fisheye, to see if this is a better solution.

The idea of being able to view all around in a spherical sense seems a good idea, but using the One R is casting doubt on the idea.

These rooms are invariably empty, so standing in a corner may provide a better and more natural viewing experience.

Perhaps you have a better answer?