Got to eat at Olives a few weeks ago. Made reservation in advance no problem. Read other reviews about balcony seating not being able to be reserved in advance went there a bit before reservation time to request outdoor seating. Was told it would be about 2.5 hours later. Was in no hurry and not that hungry at that time so no problem. Came back just under 2 hours later to check status and they were able to seat us right then.
Balcony has a couple of seats along the railing that are 2 and/or 4 person size. There are a couple larger tables in the middle and a few seats alone the doors away from the fountain. Was seated near the door which wasn't a issue since you still have good view of the fountain shows.
Wasn't very familiar with the portion size so me and my friend were going to split 2 flatbreads and each order an entree. Server quickly told us that would be too much food so we just got 1 flatbread. The server was right, there was plenty of food between the app and entree. In fact, was so full didn't order dessert.
Got the mushroom flatbread and the gnocchi with duck. Both were really good. Gnocchi dish may have been over-sauced a bit. It had good flavor and was an enormous portion.
Given the price point and it being on the strip in Vegas this place might even be considered a "bargain".
I would recommend but get here on the early side to get your outdoor seating and don't be surprised if you have to wait.