Needed to make early reservation for 5:00 based on enticing website. Lots of Japanese restaurants available, many under a 'moderate' scale, so SakeSan was (to me) a hopeful newcomer.
My impressions/experience are primarily based on my (relatively early) time of dining : No problem parking on busy shopping area Clement St. at that time of evening / Upon entering, could see an appropriate number of early diners and an efficiently-busy wait staff / A couple private, glassed-in dining areas, a larger common dining area, with optional dining @ welcoming bar, and apparently more private dining areas farther back / As a single, was seated between two tables, (cozy, not cramped) / A wall-mounted music video was playing current populars with subtitles (catering to groups is one of their night offerings) / Servers were young, efficient, friendly, knowledgeable, high energy, and attentive (at one point I dropped a chop stick and before completely resettling, a server was delivering a new set).
Menu was large/varied enough in both food selection, sakes, cocktails and wines to accommodate most tastes; due to prep time, wait time between dishes was staggered enough not to feel rushed and to allow plenty of table space; quality of food was quite good, fresh, with attention to detail in presentation. Overall the ambiance is "minimal-clean-Japanese" and welcoming.
Although an early diner, I could easily see SakeSan as an active night spot, good for groups and special occasions, with a vibrant bar scene. Will have to return for a night dinner, but from my experience, would recommend.