Oh hey, I can answer this -- I work out to ease ADHD symptoms and live in a shitty wood-framed SF apartment. Using a kettlebell or any heavy object you can hold in your hands, you can do the following routine in near-silence first thing in the morning:

Goblet squat, deadlift, bent-over row, pushups, overhead press. It's reasonably comprehensive, takes less than 10 minutes, and involves enough exercise to keep me moderately sane all morning.

The plank is a great silent exercise.

You can buy a home elliptical.

I run. I go before sunrise usually and enjoy the fresh air.