Real-estate Agents who Speak English!
Most of the individuals and agencies that list their homes and apartments on this website have someone that can show you properties and explain things in fluent English. Many, if not most, are native English speakers, or are from Germany or some other European country and can speak fluent English. Many representatives also speak German, French, Italian or other languages as well. When future tenants, tourists, long-term expats or tourists look for a rental or sale property: they want to view options from a large selection of sellers/landlords. Nobody wants to see only what's on offer from one entity.