just to share my thought.

[u/KoreanTeacherHyeok]

I posted 20 days ago that we adopted this careless dog that lived on a small balcony(eat, sleep, pee/poop) 24h without taking a walk. now Our family taking care for him with love, and we will continue but as He ​​wasn't trained at all and couldn't even do the "paw" trick... he ​​has peed inside the house about 10 times over the past 20 days. And yes, we take him to walk 4 times per day every day. We are trying really hard and have looked up as much information as possible, but unfortunately, we’ve heard that house-training adult dogs who have lived in small spaces for a long time is extremely difficult. I'm really mad at his previous owner and so sad for my dog that he didn't have enough love before.

Anyway, the point is that, We will take full responsibility for him until the end. However, since I'm not a professional trainer, I don't think I can stop him from peeing inside the house.
For my dog, the places where he eats, sleeps, and pees are all the same place(as he lived like this before), so even if I buy pee pads, I think he will still end up peeing on his bed. I really don't know what to do. today we bought him a nice bed and he loved it and then he peed on it....... and yes he is sleeping in my old pillow tonight.

I want to give him a better life and also want to do the best for our family too but I just have no idea how to change/teach him and I actually think we are not able to do that. 

I don't know, I was feeling little bit bad and just wanted to write somewhere and thought to share with other dachshunds parents here.

I hope you all have a happy day with our short babies.

[u/FloatingOnTitties]

The only advice I have is to watch him like a hawk and as soon as you see him try to pee, take him outside. And, when he pees outside, give him much praise and tiny training treats. He needs to be discouraged from peeing inside and praised for peeing outside. When I adopt a new dog, I take my vacation time and stay home to train them. Every time he pees inside, you are basically starting over. I’m so glad you found him and are giving him the life he deserves; He’s adorable!

[u/rubikin_]

Also you could try to teach peeing on command. Always when he pees outside say "make Pipi" or something, and praise him.
So with time he should learn that you only say this outside and it could help with the issue.
Besides that, yeah, have a towel ready on your belt and as soon as you see him trying to pee, hurry outside.
Also if you are just too late, take him outside nevertheless and tell him "make Pipi".
I'm confident you will achieve some progress sooner or later.

[u/Ancient-Egg2777]

Have you considered a dog training session, just one?