Location the omni la mansin del rio is located in downtown san antonio texas overlooking the citys historic riverwalk this hacienda style hotel is three blocks from the alamo and seven blocks from the henry b gonzalez convention center el mercado the largest mexican market place in the united states is eight blocks from the hotel hotel features the hotel lobby features graceful archways and a wrought iron staircase also embellishing the interior of the hotel are hand carved concier