Denver / Renaissance Downtown City Center
Open 24/7 for drinks, snacks. Snacks include yogurt, potato chips, popcorn, yogurt covered pretzels, peanut-candy-raisin mix. Nice selection.
Evening service Sun-Thu nights. Usually one hot dish and hummus, chips, salsa, olives, almonds. Enough to make a light meal.
Alcohol is served by staff. Did not take any, but the one glass of wine I saw him pour for someone else was quite generous.
Even when the hotel seemed full, we never found the lounge to be too crowded.
By the way, there is a real nice liquor store on the corner of Champa and 16th. One minute walk. Nice selection of craft beers by single bottle.