Hey! I've had the Yamaha NS7 speakers in my setup for a few months now, and I'm pretty happy with them. In terms of sound quality, they offer clear and crisp audio, especially in the mid and high frequencies. My living room is medium-sized as well, and these speakers fill the space effortlessly without any distortion at higher volumes.
As for handling different genres, they're quite versatile. I've thrown everything from classical to heavy metal at them, and they've handled it all really well. The bass is decent but if you're a bass head, you might want to consider adding a subwoofer to your setup.
Overall, considerable choice for mixed-use listening!