So this was my first time booking an AirBnb, and I was surprised how good it was!
The garden house:

The garden house is newly renovated, has wifi, a twin bed, an extra single bed, a couch with a coffee table and comfortable seats, a clean kitchen with an electric stove and all the cutlery you need. It is very clean and tidy. Robin even provided us two drinks in the fridge and some small snacks since we got there quite late and didn't have time to go to the nearby (~5-10min walk) supermarket.
The property:
The house has a big garden and a pool (unfortunately, the weather wasn't good enough that weekend to go swimming). It's right at the corner of a small street (but you can't hear any cars). Robin's mum has a child care centre in her house. All in all, it's a very nice property.
Robin:
We didn't see Robin much, but every time we did, he was really nice and helpful and provided us with restaurants nearby and information about the public transport in Prague. I think that if you want to know more, he knows most of it. His english is quite good and his dad speaks some german (but no english).
All in all, I'd give him and this house a solid 5/5 star rating combined with a really cheap price.