I'm into week 3 of having my mini sausage puppy. My observations (having been an experienced dog owner but different breed):
Toilet training is hard. I feel like we have made next to no progress despite being super vigilant, lots of praise outdoors & ignoring mess indoors. Not working so far. Frustrating. He even pees in his actual bed. Madness.
Silly barking. Exciting barking, begging barking etc. We are working hard at this and having some success I think.
Needy - he loves everyone so far but likes to be with us a lot. I find it noticeable.
Positives: cute, very smart (easy to teach tricks), very funny to watch, cuddly & affectionate, lots of people love to say hello.
If I'm completely honest, I'm not sure he is the breed for me in reality. I prefer my usual breed. Everything I've read about dachshunds seems to be true!
So, good luck. If it's your dream (like it was mine) then I'm sure you'll make it work.