I've got a Dachshund x Jack Russell. Rescue background, a bit undersocialised, but a nice dog underneath it all.
He has many of the dachshund traits - a bark so loud and deep that people who have heard but not seen him assume it's a dog 4x larger. That said, he doesn't bark for the sake of it, there's always a reason.
Aloof with strangers - literally ignores 99.9% of the human population, even if they try to engage with him. He actively likes 2-3 people, including me. I had a lodger who was there for 7 months and he literally never bonded with him (by which I mean he growled and barked at him every time he came home). My own mother gets blanked by him. You get the picture.
Territorial - we went through a period of him not letting people through the front door and had to get professional help in (he's now a reformed character)
Bit of a tendency towards reactivity - it doesn't take too many negative experiences for him to decide something should be barked at. Opinionated AF. No sense of his own size - the two breeds he hates are Irish wolfhounds and German shepherds 
Almost impossible to fully tire out. He's slowing down ever so slightly at nearly 3, but when he was younger if you have him less than 2 hours of walkies, mostly off lead, you would absolutely live to regret it. More was better. He'll walk all day and still be happy to carry on, like the Duracell Bunny. Partly this is the JRT in him, but dachshunds are more energetic than their leg length would suggest.
On the plus side, he's very intelligent, easy to train, has a bladder of steel, friendly with almost all other breeds of dog, and touch wood no health problems so far (he's nearly 3). He has a shorter back than a full dachshund which I'm hoping will prove sturdier as he thinks nothing of jumping a metre high from a standing start. Completely obsessed with balls and will play fetch for hours. Like most dachshunds he likes to sleep under the covers, so he's an excellent hot water bottle.
I adore him and I wouldn't be without him, but would I go for another the same again? Probably not, I'm hoping for an easier life... However, they have a lot of fans and those fans tend to be very into the breed (bit of a marmite breed I think). If you go on Facebook there are a lot of location based Facebook groups that organise walks for the breed (eg London Lowriders) so you can speak to the fans of the breed! It might be a good idea to go to a local dachshund walk so you can chat to owners and meet some.