I just got back from a long weekend in San Antonio where I patronized three restaurants based on reviews from this board. In the spirit of giving back to the community, I am posting short reviews of my experiences.
Mexican Manhattan is really one kitchen with two restaurants. The first restaurant is on the Riverwalk, just off of the main loop onto the straight part of the river. The patio was full when we went and there was a wait. The second restaurant is inside the building and on street level, where there is an entrance from downtown. Here there are lots of tables in multiple rooms, and it was nowhere near full. The atmosphere in the street-level rooms is less appealing than on the Riverwalk, but the food is the same.
Wherever you end up eating, the kitchen serves good, but not especially exceptional, traditional tex/mex. There are no surprises on this menu. I ordered the steak fajitas and my companion ordered an enchilada plate. We were both very happy with the quality and flavor of the food.
The prices here are low to moderate, with a dinner for two coming in at around $50 including gratuity and drinks.