I have been to Flash's many times and my only complaint would be how inconsistent the attitude and atmosphere are. I can be there for drinks after work and the bartenders tend to seem bothered that they have to come and ask what you would like to drink or eat, very confusing, isn't that their job? Then another time I went for lunch and had the best waitress (I think she is part owner, so naturally knows how to treat her customers) and it was just a lovely lunch, but it's dicey at best, you just don't know what to expect with the staff. They have good food, I've been disappointed with that, so it's hard to recommend it to others?!?! Although in an upcoming after work gathering, I suggested that we go to Flash's, trust me, I will have my fingers crossed all night!!
The menu at Losteria has something to please everyone. Obviously family owned and everyone there cares deeply that the customer is satisfied. We have been on every visit!! The service was exceptional, the food always excellent. Some menus have 6-8 appetizers and 10 - 12 entrees to choose from. This menu is not at all limiting, with something to please everyone. Pasta's, seafood, chicken, veal, beef!! You name it, they have something for you. Definitely our favorite spot in the North End for authentic italian food. (and we've been to italy several times!!) You will enjoy your dining experience here!!
Boston doesn't have any other all night places. The Diner's unique place in the city's nightlife means that it has to be somewhere where all are welcome and everyone has to be cool with everyone else. I've seen drag queens and cops, drunk Red Sox fans and weary travelers waiting for the first train out of South Station, and even big stars. Last week, Neil Young was in, and last year I sat next to Richard Dreyfuss. It's a great mix of humanity, in a city that tends to have everything overrun with college students. Cheap eats, and a front row seat on the grand parade. It's a beautiful thing.