Yeah mostly for private rooms. If I was travelling solo, I'd definitely go that route. I mainly rent private rooms with AirBNB when I travel solo, since its cheaper.
I'm not paying $400 per night for a room, thats ridiculous. I'm splitting the cost so it works out to $225 total for the two nights. I'd basically be paying the same thing if I were renting a private room on AirBNB.
I like AirBNB though sometimes they can be as expensive or even more then hotels. And the service fee + cleaning fee (which the host charges) + taxes can sometimes be ridiculous on top of the nightly average rate. You have to do your research and see what works out to be cheaper and more practical. As well, if you plan on staying somewhere for a week, having your own apartment with a kitchen is a lot better then staying at a hotel.
As for Uber & Lyft promos, tried redeeming them when in Portland and Seattle back in September, though they are only for new accounts only.