Silvia is a great host with a lot of attention to detail. She prepared the most delicious breakfast for us each morning, which is really an added plus. Her house is just a minute's walk from the bus stop. It then takes about 20-30 minutes to get into town on the 31. We took the bus constantly and found it very convenient. Every time we thought we had wandered really far while exploring Zurich, we'd run into the 31.
The only thing I would note is that the shower/toilet are in separate bathrooms, so while the shower is on the same floor as the bedroom you do have to walk down the stairs to use the bathroom. Not a big deal, but wanted to mention it in case that's helpful information for anyone :)