I stayed at Stephanie's for 4 months, so hopefully this will help others considering a long term stay at her place:
Pros:
Very dog friendly!
Location...if you don't have a car, you will be fine here. You can't beat this location for the price, especially for a furnished short term stay.
Your own washer/dryer
Very comfy bed
Dedicated parking spot if you do have a car, which is great for this area
Stephanie is very responsive to any needs you may have during your stay. I had nothing but positive experiences with her.
Room for Improvement/to take into consideration:
This is a basement unit, so you'll hear people/dogs/occasionally kids upstairs. This was not an issue for me.
There is cable (awesome!) but the TV is not a smart TV and there is not a streaming device. I brought my own and plugged it into the HDMI port in the TV. So if you're a streamer, bring your own device.
The couch seems to be a piece of a sectional, so sits a little awkward and there's not an arm rest on one side. An updated couch would go a long way, but if you're not super picky, it's not the end of the world.
I had no problem with the heater keeping the space warm, and I was here Jan-May. I imagine it would also stay pretty cool during the summer months, considering I still used the heat occasionally on the few 60+ degree days we had during that time.
I would recommend this place to anyone needing a longer term stay in Seattle!