Anna and Chad's place is a great option for a trip to Austin! I didn't find it noisy; there was little street noise (and their chickens were quiet!), and they do have a white noise machine and ear plugs available. The room has dark (but not black-out) curtains, so it lets in a bit of light: it's pretty dark, but not 100% dark at night/in the morning.
Anna was great with communicating by text, and we were able to check in early (and even if we hadn't been, we'd be able to store our suitcases at their place before/after check-in.)
It's a fantastic location, especially if you want to eat vegan food: an easy walking distance to amazing vegan restaurants like Counter Culture, Vegan Nom truck, Capital City Bakery, Mr. Natural, and more. They're walking distance to a brewery, grocery store, and other restaurants/bars, too. Lyft rides to downtown for tourism are around $8.
The bed is very comfortable: king size, and a lovely firm mattress (though the pillows are very soft; if you have neck/shoulder issues, you may want to bring a firmer pillow.) Warning, though: my friend and I bumped our legs on the sharp corners of the bottom of the bed/footboard multiple times!
I didn't have a car, but parking doesn't seem too tough on their street. I plan to stay here again the next time I visit Austin!