My Mihile is level 150 and about to level to 151.
This is where I trained. It's not the best, but I'm lazy to move around so just follow this guide and every 5 levels move on to another map higher if you have the time.
I have alot of time & patience. Just put music that doesn't repeat & grind away.
1-10 - any low level monster. Shouldn't be a problem.
11-15ish - mushrooms @ henesys maps. Shouldn't take long.
15-20/24 - Golems
25-30 - Mixed golems. You might get impatient at these levels, but once again - I'm lazy so I don't go to other maps. I just grind to 30.
~2nd job Advance
30-40 - Mushroom Kingdom quests & Helmet Pepes
40-55 - Scarecrows
55-60 - Meerkats at Ariants - Takes awhile, but the map is always empty.
60-70 - Scorpions - 65-70 might seem like hell, but thinking about getting 3rd job motivates me to just grind. Once again, due to pure laziness.
~3rd Job Advancement
70-90 - Romeo & Juliet PQ Grind/Scorpians again - Grind with music, it takes awhile. OR mp3
90-110 Aliens. I usually train at map 5 to just avoid Ksers and hackers.
110-120 - LHC Party
~4th Job Advance
120-150 (Where I'm at) - LHC
The maps are not all that great but I'm the type of trainer who likes to be in an empty map. I grind nonstop. You need patience. I know there's better maps there, but I've always done it this day.
Hope I helped somehow
A good alternative if you don't mind the pot burn is Azwan at 40+, I got to 48 in about 3 or 4 runs which is less than an hour...It's a meso sink but If you don't want to deal with people, It's decent.