Reporting back on TravelCar -
Lot: The initial lot is small and very close to 101 Broadway exit. If you book TravelCar SFO (valet) option, they keep your keys and can move your car to another lot if space is needed. The spillover parking are the adjacent properties by the hotel & Max's Cafe. The lot itself might be locked after hours as it did seem to have a link fence (normal height construction rental) around the non-street sides of the lot. No idea if they do lock the lot somehow. It is definitely drive/walk in during the open hours and I imagine someone could walk in out of the service desk line of sight from the two entrances or if they were busy with a customer.

Drop-off: Pulled right up, removed luggage, and walked into small building to drop keys off with the single agent at ~ 6 am in the morning. The lobby has a small coffee maker & water cooler, plus a bathroom down the hall. The agent will order a Lyft on their account and ours came within 5 min. Once the rideshare is ordered, a text message is sent to the booking's mobile # with the driver's name & car description. The agent can track the Lyft location but the text currently doesn't offer any tracking. Agent will also provide a phone number to call for pick-up which you meet on departure level.

Pick-up: Arrived around 8 pm. We called the TravelCar arrivals phone number twice. First time, no one answered the line. Second time, we reached a TravelCar agent whom we provided with guest name, terminal and door #. Agent sent a Lyft, time estimate, and texted the pick-up. The text estimated a 3 min pickup but it took more like 6-8 min? Still quicker than many parking shuttles. The car was parked for easier exit and we waited a few minutes to speak with the single TravelCar agent who was helping other customers. She returned the keys and off we went. Payment was billed to the card provided during booking. Lyft rides are paid for by TravelCar with the TravelCar SFO parking option and we opted to tip the drivers in cash.

The other options are to rent your car out or self park. Opting to rent your car out provides free parking and money if someone rents your car. If you self park, there is no $10 service fee, no included rideshare, and your car won't be moved from the original parking space. You could be blocked in by another car when returning as we saw double parked cars.