Had a wonderful stay with my family (4 adults, 2 children). The location is ideal -- quiet neighborhood but incredibly convenient and fast access to downtown Zurich with the nearby tram. The place was spotless and new, and well-equipped for our needs. The kitchen is small but perfect for a city stay and equipped with all the basics, and we enjoyed the spa-like showers.
The upstairs loft does not have a door, so if you need all three rooms, I think this place works best for families or other groups who don't require total privacy (the two main floor rooms are fully private). We had a bit of difficulty with the bathroom lights, which go on automatically upon entering and go off on a timer, so it was a bit of a challenge in the middle of the night etc. but this is a minor issue only (and perhaps just user error on our part?). The walls are sloped in many places and the staircase beam cuts across the hallway, so taller guests be alert.
The hosts were very responsive and graciously allowed us an extra hour for check-out.
All in all, I would highly recommend a stay at EMA House!