To begin with, I would suggest using the stairs to the south of the passage marked by the game). Going down below, you just need to go to the door and, therefore, walk to the Ratway.

Start exploring The Ratway. Soon enough, you'll meet Hughnon Black-Skeever and Draff. You will have a chance to avoid fighting them if only you have a sufficiently high speech skill and use persuasion, but you will most likely be attacked by them immediately. Adjust your tactics depending on who you are fighting at the moment. Since the battle will take place in a narrow corridor, you can also use the Cry of Relentless Force. Search the bodies of the defeated enemies and return to the study of the sewers. Eventually you need to get to the raised drawbridge. Don't pay attention to it and jump to the lower level.

There are two paths leading to the next place. The shorter it is, the more you need to open the protected eastern gate. If you can't open it or want to explore the area more thoroughly, use the west door. Look for the first trap associated with this passage, in the form of spikes coming from the side after you open the door.

If you chose a longer path, you should take into account that you will have to eliminate Skeever and Gian the Fist. The second one prefers close combat, so try to attack him from a distance if he causes you problems. In the room where Gian was, you will also have to look for bear traps, avoiding or disarming them. Fortunately, even if you hit one of them, you won't lose too much health. Keep going on. Along the way, you will encounter another trap related to the pressure plate on the stairs leading to the upper level.

Both paths described above lead to the same room, inside which you will have to heal. After that, be sure to look in the book for the book "Beggar" to increase your pocket. Use the door leading to the underground hotel, Ragged Flagon.

Now you need to establish the exact location of Esbern, and you will have several options. The most obvious is a conversation with the bartender, a Man of the Century. Depending on your preferences, you can either pay him for information, use developed speech and convince him, or challenge him to a fist fight. A less obvious option involves talking to Brynjolf, although he will reveal Esbern's hiding place only if you have completed the side quest "Agreement on Occasion". https://cheathackfortnite.com/fortnite-cheats-hacks-aimbot-esp/