Palo Alto, CA
I have been their customer for more than a decade. They used to sit in Palo Alto. Their clean and organized shop was impressive. I remember I brought in my 87 Nissa that was having an issue with its air conditioner. Nearby Nissan dealer could not fix it completely even after several tries. However, Helming's guys just fixed it by replacing a small valve. Though they moved to the current location in Mountain View, I am still their customer. I have been happy with their services and advices all the way. If you are not happy with your mechanic, bring yours to Helming's. You might be surprised.
I have purchased a full set of tires for my Nissan four years ago. I went down to the shop, since they have a high-end balancing machine. They do not cut corner on their tools. That is a good indication that they care their quality of work. Because my Nissan is very sensitive to tire balance, I asked them so called "match balancing". It came out right so that I did not need to feel any strange vibration on my steering wheel. Their staffs are friendly and making efforts to satisfy their customers. I went back there to fix a puncture later. I was happy to see them and their work again. I would recommend them to anyone with a car. I would definitely go back for another purchase.