Matt's Airbnb is small but really cozy. I've been there for one week during a convention.
The location is fantastic, a 10 minute walk to the gaslamp quarter and a 15 minute walk to the convention center and harbor. There's also a trolley near the Airbnb which can bring you to the convention center. The trolley can be a little bit loud at night but it's alright if you close the windows. In addition to that, Matt provides some earplugs.
I haven't used the kitchen at all, so I don't have anything to say about it. There are some great restaurants and bars around the area. I can fully recommend 'The tipsy crow' (bar and some amazing clam chowder) and 'Brians 24' (breakfast).
The bed is big enough for two people, even tho the bed sheets are a bit tiny (I'm 6'2") and the bed is a bit hard.
Overall I didn't have any complains and can only recommend Matt's Airbnb! Getting in via code locks made the check-in process easy!