Berlin's endless rows of tenements were once horribly overcrowded, with large families often living in one- or two-room flats. But in recent years, these so-called Altbau, or old buildings, have enjoyed a rapid renaissance. These blocks in the Prenzlauer Berg district of Berlin were, until the early 1990s, often empty and in a state of severe disrepair. Now everyone wants to rent an Altbau.

In former East Germany, where nearly all accommodation was rented from the government, prefab concrete housing blocks known as Plattenbau rose up across the communist nation. Not only were they cheap, but they were often preferred to Altbau apartments because they offered all modern conveniences like new plumbing that didn't leak, reliable electricity and hot water.

According to the most recent statistics from Statista (2015), 48 percent of Germans rent and 52 percent are home-owners. Most renters live in apartments - and make the most of their balconies. Some barbeque or lounge, while others grow overflowing gardens that utilize every last inch of precious outdoor space. Balconies can be veritable ecosystems that become rather bleak in the winter months.

In some Germans cities, particularly Berlin, rental houses are made up of front and back buildings separated by an inner courtyard through which the life of these rental communities ebb and flow. They are unique communal spaces across which people view each other's lives, and where they interact as they park their bicycles or access their numerous garbage bins.

Only the names of residents are used to identify the flats inside a building in Germany. These names on the intercom of a Hamburg apartment building typically have no corresponding flat number. That means you have to address letters to Germany clearly because the mail carrier only has the name to go by.

Known as WGs, or Wohngemeinschaften, shared apartments are popular in big cities where apartment prices are rising and availability is shrinking. People who share flats often also rent out the living area to bring prices down as much as possible. This is especially so in Berlin, a city full of artists, students and people on low budgets.

Painting the apartment before you leave is another German rental tradition. Leaving the walls shiny white for the next residents isn't such a bad thing - but it means you have to spend days preparing walls and climbing ladders before you move out. Not all rental contracts force tenants to paint the apartment - however they are obliged to leave it as they found it.

In some German cities, kitchens and appliances are not included in rental properties. That means the tenant has to purchase their own and have it installed at their expense. Alternatively, some people buy the previous tenant's kitchen at a discount if they aren't planning on taking it with them to their next living space.

Among the quirks of Altbau apartments is that many didn't use to include facilities, which were sometimes shared communally. That means that you'll find bathrooms today that are wedged into the smallest - and oddest - spaces. Or, in some cases, they might be huge and replace an entire former room. This shower in a Berlin flat was built in the kitchen cupboard.

When scanning apartment listings in Germany, you'll generally find the sizes given in square meters and the number of rooms. The latter includes not just bedrooms, but also living space. The kitchen and bathroom(s) are listed separately. Apartments are most expensive in Munich, Frankfurt and Stuttgart, where new tentants pay on average 16.55, 13.37 and 12.95 euros per square meter respectively.