This is my work neighborhood (Florida and Mariposa) so I am quite familiar with the lunch options...dinner not as much, but I believe it is basically the same.
Street parking is generally not too bad at night, but put anything that looks valuable in the trunk, and you would be well advised to use the Club or an alarm.
The Slow Club is always excellent. Burgers with excellent fries, flatbreads, meat main dishes, nice desserts such as bread pudding, and there is always one vegetarian main option. Excellent bar and if you are driving, try the house-made lemonade or iced tea.
Universal Cafe is quite similar to the Slow Club, I do not eat there often because it is not open for lunch every day, but when I have had dinner it has been great. Still thinking about some chicken livers with pomegranate I ate there in 1999....nice drinks here too.
Blowfish Sushi has great bento, I love to get tempura and maguro sashimi; the sushi is good quality, lots of complicated rolls (which I do not especially care for). Fancy drinks. Be prepared for sensory overload as there is loud music and multiple screens of anime blasting.
All three of these are within walking distance, and all are pretty loud, and will be busy but you can get in if you are prepared to wait a bit or hang at the bar.
Depending on the day you go, there may be a dinner happening at Coffee Bar. Thursdays and Fridays are Radio Africa Kitchen night -- have not been but the menus look delicious. I went to one of the special visiting-chef dinners here recently, and it was great, but the room is really designed for coffee and Wi-Fi - the backless benches and metal stools will chap your hide at a two-hour meal. If there is not a dinner that night, you can get good coffee and maybe a croissant or Dynamo donut.
Also coffee and prepared snacks at the Starbucks at Mariposa and Bryant. The staff here are very nice, if you need to hang out it is not unpleasant.
A quieter option is Evergreen Garden at the foot of Mariposa. It is big -- always space available, the outdoor room is lovely if it is not too cold. You will not confuse this joint with the Slanted Door -- my Vietnamese colleague used to say it was the worst Vietnamese food in the world. He exaggerates a bit. Anyway, the worst Vietnamese food in the world is still better than most. It is very clean and the staff are wonderful; the pho is decent, the rice noodle plates with imperial rolls are good, and they also have Thai dishes which are not bad -- the garlic pork noodles are very tasty.
Not within walking distance, but a short drive away (five minutes) is a newish Italian place called Pizza Nostra. Nice pizza, not so noisy, and it has an actual parking lot.
Here are the links.
2814 19th St, San Francisco, CA 94110
2501 Mariposa Street, San Francisco, CA 94110
Blowfish Sushi To Die For
2170 Bryant Street, San Francisco, CA 94110
1890 Bryant St, San Francisco, CA 94110
300 De Haro St, San Francisco, CA
Radio Africa & Kitchen
480 Third St, San Francisco, CA
3100 18th St, San Francisco, CA 94110