The Kasa was ideal for my month-long stay as an initial base during my relocation to San Francisco. The location is great — only a couple of blocks from the buzz of Fillmore street. Union street and Hayes Valley were also short walks away, so there're a plethora of bars and restaurants in all directions.
The Kasa itself is as advertised. Everything is newly installed, clean and modern. The virtual front desk system did a good job of guiding me through the check-in process and informing me where to find things. Thankfully, there are still means to contact a real person when necessary — I was able to contact a member of the Kasa team when I discovered the water wasn't running one morning and everything was dealt with promptly.
The only minor frustrations I encountered were some occasional noise from building work — I guess there are still some final things being finished off. However over the course of my month-long stay this only occurred once or twice. And I suspect had I been on a vacation or generally out-and-about as opposed to working throughout the day from the Kasa, I may not have ever noticed.
Overall I was really happy with my experience, would recommend.