Since we arrived several days ago in Tokyo, we've tried a wide range of options for eating.
Breakfast
First morning we had breakfast at the hotel but we found that the value offered for the price was mediocre. So the next day we went in the city. My daughter found a coffee shop that had fluffy Japanese pancakes on the menu in the Oimachi quarter of the Shinagawa district, so we went there. We weren't disappointed, as the price was very reasonable and the quality excellent
Lunch and Dinner
For lunch and dinner, we've experimented widely.
At the lowest end, we snacked on cheap Japanese snacks.
Slightly up the scale, we went today to the Tokyo flea market and bought cheap noodles and yakitory from a food truck. It frankly wasn't good, but at least it was cheap (and I wasn't ill afterwards, so I guess that counts for something too). I didn't think that meal was worth a picture so I can't illustrate. However, keep in mind that you usually get what you pay for. My noodles were 1000¥ (about 6€) and they were not worth a cent more.
The mid-range option was a local "sushi train" restaurant. Decent and cheap and cheerful, but nothing to write home about.
Walking in the streets of the Shinjuku district this evening we went a bit upscale with a "cook your own meat" restaurant who served various cuts, from cheap chicken to Wagyu beef.
The "crown" went to a spectacular dinner with "Shabu shabu" and Sukiyaki dishes in the Shibuya tower, 12 floor. Relatively expensive (about 120€ for the three of us, which would count as "cheap" Stateside), but worth every yen.
Various
We also tried some cocktails on the 52 floor of the Mori tower in the Roppongi hills. They were OK but quite expensive (exclusive location). What was particularly surprising and unusual was the very mediocre service there.