On a recent visit to California, My husband, my friends and I were staying in a central hotel on Eighth Street. On a couple of occassions we stopped into Sam’s Diner on Market Street, for breakfast. 
Sam’s Diner was recommended to us by the recption at our hotel and it was a good call. The menu is varied and offers breakfast dishes from fruit or oatmeal to eggs benedict . On our first visit we were seated in the boothe commorating the service of a former Mayor of the city and there s a large TV on the wall to watch the news. It was really rather nice.
The entrance to the diner is easy for those with mobility problems, but most of the seats were at booths or high seats at the counter so I am not sure that wheelchair access is realistic.
Service was courteous and our orders were taken quickly. I had a spinach and cheese omelette while my husband had a full breakfast of eggs, sausage, bacon and potatoes. One of our friends had eggs benedict while the other had a scambled eggs with vegetables through it. We all enjoyed our meals, although I could not finish mine, it was just too much food. The friend who had the eggs benedict would have preferred more hollandaise sauce. 
One thing that we all agreed on was that the blend of coffee served at Sam’s Diner was a very strong blend and not entirely to our taste. This was so much so that on our second visit, I took tea instead.
Sam’s Diner was a great find during our visit to San Francisco and I would certainly recommend it, especially if you like very strong coffee.
Val Penny
Val Penny's Hotel and Restaurant Reviews 