I stayed at Regina's place for the last two work weeks and greatly enjoyed the central location, the comfy digs, and the hospitality Regina provided.
Because I was traveling on business and working near City Hall, the location was prime: less than 10 minutes walk to the office in the morning and many breakfast spots along the way. The "Old Oakland" area (around Washington and 9th) is a similarly close walk and has some great restaurants and bars for the evening hours.
Staying at Regina's was a very comfortable experience and included everything one would need for an enjoyable stay. A few highlights from the room: it had its own thermostat, the bed was very comfy, and there was lots of closet space.
Regina is an amazing host -- very friendly and conversational. (Not to mention, she offered French press coffee in the mornings!) She truly made her airbnb seem like home for me, and I'd highly recommend her place to anyone traveling to downtown Oakland.