Avoid them at all costs!!!
I had a terrible experience with both the Berlin Apartments and Expedia in June.
I stayed 25-27th June, two nights of the four we had booked. On the second morning I woke up covered in bites and discovered the infestation of bed bugs. Myself and my friends child were bitten by the bugs. I have over 100 bites and had an allergic reaction to them. It has been a month and I have scars and marks still.
I have had no help at the time or follow up from either the accommodation or Expedia regarding the early departure and alternative accommodation. We ended up sourcing another apartment through a competitor site.
I was refunded from Expedia the two unused nights and offered £17 as a good will gesture for the inconvenience. We incurred numerous costs from last minute accommodation change to medical and medication and have not been reimbursed from Berlin Apartments or Expedia for any of it.
Stay well away from them should you not way to be eaten by bed bugs, left stranded without accommodation, pay a premium for last minute accommodation, cover all medical costs for something that should have been preventable, as well as pain and suffering with being bitten over 100 times and having an allergy to the bites.
This included two visits to the hospital and two to the Dr, two courses of antibiotics, antihistamine, creams and lotions.
Never again will I use them or recommend them.