First thing, this accommodation is hosted by a company. As such, my messages were answered by more than one person, and the only time they responded was with regard to checking in early (which required an extra fee). I paid the fee (through a separate app, by the way, which I would not recommend. you will see why later) and was told that I would be able to check-in early, however, when I attempted to do so, I was basically ignored by the host, who only said that check-in was at the regular time, not at the time I paid extra for.
My partner and I were left out in front of the apartment, in the cold, for 3 HOURS, waiting either for a message from the host of information on how to get in. The original message on how to enter the apartment required us picking up a key about 1 mile away from our previous location. As I hadn't received any updates regarding this, I walked the 1 mile to the office, which I was told by a sign on the door was closed. The office being closed isn't a problem, but NOT TELLING THE GUESTS THE OFFICE IS CLOSED IS A PROBLEM. I phoned the number on the door, as instructed to do by the sign on the door, and was met immediately with a automated message telling me the lines were busy. I hung up as my phone is charged international fees, but all later attempts to contact this company by phone ended in failure.
I walked back to the apartment, where we decided to wait in front of the accommodation as we tried to get in touch with AirBnB's customer support center. As you can imagine as this time, it took almost 1 hr (but luckily we were able to use an internet phone service for this to avoid extraordinary fees). AirBnB only told us that they would try to get in touch with the host, and then they would get back to us, which they never did, so we were dealt a double-dose of company (though in AirBnB's case corporate) disappointment.
After waiting until the original check-in time, outdoors mind you since most restaurants were closed by then, we were able to get into the room. The room itself was fine, quiet clean and with a great view of the market in front of the apartment. Unfortunately, there is no cable in this apartment (though it says there is on the listing), so we had to use BBC's streaming platform for news updates.
As of today, no one at the this company has gotten back to me about my request for a refund of my payment for early check-in and no one has apologized.
I wish I could recommend this accommodation to others that like the Harry Potter theme, but honestly, there are other accommodations with better Harry Potter themes that are run by people that care about their guests. AVOID THIS ACCOMMODATION IF YOU CAN. The Harry Potter theme hasn't been executed well enough for you to ignore the absolutely abysmal treatment of guests.