This was my first Air BnB experience and I am so pleased it was at Katja's guesthouse.
The space is perfectly sized for one person and the location makes it very easy to get around Santa Monica by walking, public transport, or Uber.
Most of the time the space felt completely private and the few times I met Katja and her family everyone was kind and welcoming.
I was also so grateful that there was air conditioning and a small fan because it was unusually hot when I stayed. I was also happy I brought a small fan with me because I'm particularly warm blooded.
I was also happy that the tiny freezer worked so well in the mini fridge and I was able to make ice for my Yeti tumbler. I brought 4"×4" ice cube trays but I think you could fit a normal sized one if you wanted.
I'm 6'4" and a bigger guy and had been concerned about the size of the bed but I not only fit but was very comfortable. The restroom is snug for an extra large person but nothing that wasn't manageable and I suspect is totally fine for everyone else.
I would definitely recommend staying at Katja's guesthouse if you're visiting Santa Monica and if you're lucky maybe you'll get to hear some beautiful live piano music from the main house when you're passing through on the deck.