To add to the above, I am not sure on the arrival times from MLE but the timings will determine how busy the lounge will be. The lounges sizes vary across the different concourses but they can all get really busy at peak times. A lot on here advise on eating in the lounge to skip the food onboard, however, if it is your first flight in J I am guessing you will be trying everything anyway.

I am not sure on your expectations and maybe I am just a grumpy traveller now but in essence a lounge is a room, with some chairs a bit of food and some booze. There are toilets and showers which again can be really busy or quiet depending on the time you are there. To put in bluntly, I would not worry too much if you do not get much time in there!