Simply blues style riff, almost heavy distortion but it pulls back enough to not call it heavy. Some garage rock, independent style of blues you might call it. Some difference variations are throughout the piece.
Recorded with a hyperdirectional ssh6 capsule - with the stereo mic open at a certain extent - (via the zoom h6) the fireplace's sound has an impressive presence and more space. The avenue noise can be heard as well from time to time.