I stayed here for a short visit to Caltech.
The location is great, with Caltech and good restaurants nearby, within walking distance.
My main problem: it's hard to find the place. It's hidden in the garage of an apartment. I had to call the owner to get help, and it was hard for them to help me navigate on the phone so they had to come in person to let me inside. I checked in in the middle of the night and there was a person fixing his bike in the garage, so I really did not expect the entrance to be this hidden door in the garage.
There are also some minor problems. I did not care too much because I spent most of my time outside.
1) furniture is old so there will be some faded stains and peeled texture here and there. Same with the towels.
2) bathroom is small.
On the other hand, I give them credit for 1) being responsive 2) providing some breakfast food like cereal and oat milk
Overall it was fine for me after checkin. But probably not worth the price.