The location is excellent.
The arrival time was coordinated previously and it was all fine.
I suggest to bring earplugs since the apartment is located just besides the elevator so every time someone takes the elevator you heard all the noise, so you can't rest much.
I will strongly suggest to have at least a toaster.
Additionally if they have many guest Mabel should have at least of what should be checked before guest arrival, since internet was not available until almost the next day.