1. Yes, that's right - a FREE walking tour! Where and when I hear you ask? Get down to the Starbucks Café on Unter den Linden (opposite the Brandenburg Gate) at 11am, 1pm and 4pm where the tours, which take in the Berlin Wall, Checkpoint Charlie and more depart daily. All it will cost you is a tip, and if you get a guide as informative as the one I got, you'll be sure to tip generously.

2. If you plan on visiting any of Berlin's National Museums, leave your visit until Thursday evenings (after 2pm) when they are all free. There are 16 in total. This includes all the museums on Museumsinsel, the Museum of Decorative Arts in Tiergarten, and the Museum of Indian Art on Taku Str.

3. Some of Berlin's most fascinating buildings are its churches. Marienkirche, overlooked by the TV Tower and dating back to 13th century shouldn't be missed. Neither should Kaiser-Wilhelm-Gedächtnis-Kirche in Charlottenburg in the West, which is a chilling reminder of the war. Most have free admission.

4. As Berlin is one of Europe's largest cities, you may find yourself using public transport quite a bit. Rather than up to €2.40 for each single journey, buy a 'Tageskarte' (day ticket). Costing €6.10 for 2 zones (that will be enough) they are valid until 3am of the day of purchase and cover all modes of transport.

5. Travelling from one side of Berlin to the other, buses #100 and #200 are the perfect (and cheap) way to take in all the main sites. Just part with €2 for your ticket and take bus #100 from Alexanderplatz to Zoo Station, passing the Reichstag among other buildings. Then jump aboard bus #200 back the other way and travel through Potsdamer Platz.