Sylvie's is a good place to just have a rest and go out and explore the city. Location is great, 15-20 minutes from Union Square by car on a busy day. Wifi is also great, with download around 300 Mbps. Bed is large enough for 2 people and comfortable enough for a good night sleep. TV comes with literally hundreds of channels. The bathroom is good with hot water and proper amenities.
The minuses. The place is not ventilated and doesn't get much sun. This is why there's a mildew smell present. We kept the door open every night and morning for a few minutes but it's not enough. The owner controls the heating which she said will turn on at night and morning for 30 minutes. The problem is that it works through the ventilation in the bathroom and it brings in a smell of food from the kitchen I suppose. It makes enough noise to wake me up so we were advised to keep the bathroom door closed.
All things combined make for a place that offers good value for the money (aribnb is not cheap in San Francisco) but you need to understand the limitations of such a good deal.