It is sad to hear your feedback especially after all my friend and I did for you to make your stay as confortable as we could, even with me away and without charging you the full price for a place by yourself.
The electric issues have been investigated and they are not from my place. Maybe you should check your devices or not switch on too much devices at the same time on a normal flat connection (it is not a house Dennis).
For the sofa bed, it is more than confortable and it is a not a standard quality of mattress as you are telling. I'm not a 4 stars hotel but the mattress is the quality I hope to make my lovely guests happy as they were since the beginning I started to host people with Airbnb (my reviews can tell it as you can read and see it).
On the other hand, the size of the place is on my advertising and as well that it said that it is a share studio.
I'm sad again to hear that you were not happy to be by yourself for the price of a share place with its own main room, bathroom, kitchen and backyard fully equipped as a real big flat. My prices are more than correct if you are comparing them with the current market and you get all amenities that you need and even more when you are at mine (bed already done, clean towel, chocolates, aircon, heater, unlimited wifi (which is working too), big TV screen, very tidy and clean place, etcetera... for a budget price).
I hope you will find a place that it will suit more your needs for your next Airbnb and but unfortunately and certainly more pricy.