First and foremost, Poppy was an incredible host and great help to us. Very responsive and always helpful. Highly recommend her as a host.
The studio is in a great spot, with most of Fira being a 10 minute walk. With that being said here are a few things I wish I knew when I booked...
My biggest suggestion is that the bathroom is difficult to use, cramped, and the shower requires a curtain that wraps around like an L shape (so you have one corner with a wall and the other corner is a curtain... difficult to describe). So it's very awkward and feels very cramped. The bathroom also has a window that is always open because the shower curtain is mounted above it and prevents it from closing. So people can look in on you (that did not happen to us, and I honestly don't think it would... but it could bother others). It also allows in some noise from the neighbors and the outside which is sometimes noisy. If it is hot out it also let's in a fair amount of heat which requires that you close the bathroom door to keep the AC inside.
The other thing is that there are some creaky or squealing pipes, where I think if the neighbors use water you can hear that pipes make noise. Sometimes later into the night (for us I think it didn't happen later than midnight but could happen early around 6). Could be loud enough to wake some, or prevent you from falling asleep.
The patio was nice and large which is great for early risers to witness the sunrise!
Otherwise when you put it all together and you consider the cost, I think it's a fair deal. You just have to know what you're signing up for. I think it's a great choice for those wanting to be closer to the action, don't need much space, have a tight budget, and want more of the "city feel" Santorini has.