carpet
I agree that the carpet is unfortunate and will probably soak up a lot of the reflections/reverberation that is desired in a stair well recording.
Try it out, but def keep your eyes open for a concrete, boomy stairwell.
I great way to test it is to go there are literally yell and see what kind of sound you are getting back to your ear. Try high and low pitches/frequencies, different volumes and multiple stairwells to get a feel of what it will be like. You can try to find the resonant frequency too by humming loudly.
Good luck though, seems like a lot of fun.
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