Here is stuff that is not necessary to know and is too long to put it into main description.

How to turn on console commands:
Open text file "The Witcher 3/bin/config/base/general.ini", add new line, paste text:
DBGConsoleOn=true
In game, use tilde ~ key to open console
Original game console commands: https://steamcommunity.com/sharedfiles/filedetails/?id=765050564

Сonsole command NL_GetPosition()
Pauses game and displays ok-dialog with current player position. It can be used with tptopos(x, y, z) command for precise teleporting.

Console command NL_GetStartingSet1()
Gives armors and swords which you start the game with. Nothing unusual. Except that original game does not provide any other legit way to obtain these items if you lose them.

Console command NL_GetStartingSet2()
Gives armors and swords which you start the game with in "Hearts of Stone only" mode. Compared to StartingSet1, this set looks exactly the same, but with better stats. Original game does not provide any other legit way to obtain StartingSet2. Chest piece is not upgradable to warrior's leather jacket, because its recipe needs item by ID "Starting Armor" from StartingSet1. While chest piece from StartingSet2 has ID "EP1 Standalone Starting Armor".

Console command NL_GetStartingSet3()
Gives armors and swords which you start the game with in "Blood ad Wine only" mode. Original game does not provide any other legit way to obtain StartingSet3. Chest piece is not upgradable to warrior's leather jacket.
In original game, this set has almost the same stats as StartingSet2. In No Levels mod, StartingSet3 items quality has been changed from yellow-magic to brown-relic, and has been given better stats than StartingSet2 to make things different and maybe interesting.

Console command NL_GetRavenSet()
Gives armors and swords from Raven set. Actually in the game it is called "Legendary Manticore". But it looks literally like Raven armor from The Witcher 1. Original New-Game (not New Game Plus) does not provide any legit way to obtain these items. In NG+ regular Manticore set items are replaced with Legendary Manticore items. Both these armor sets look differently, not the same as compared to other regular (NG) and legendary (NG+) witcher sets.

Console command NL_GetDebugSwords()
Gives 6 silver swords which have 100% chance for bleeding, burning, poison, freezing, stun, stagger. Some swords also deal "fire", "frost" and "poison" damage, instead of regular "silver" damage. These swords are not part of original game and were added by No Levels mod for debug purposes. You can use them too at your own risk/fun. It seems that if you save the game, while having these swords, then uninstall No Levels, then load the save, game will delete these swords, because it won't be able to recognize them.

If you want to see item IDs or other details about these commands, you can find them in modNoLevels\content\scripts\game\modcode\modCommands.ws