Here are the solutions:
No 1: Moustique, cca 1925 made in Brussels, Belgium - Faksta
No 2: Kevah cyclecar, cca 1923 made in Paris, France - ftg3plus4
No 3: Puma Gatto Spyder, made in Rome, Italy - Paul Jaray
No 4: MDI Taxicat made in Luxembourg - 75america
No 5: Ruska Regina made in Astermdam, The Netherlands - guido66
No 6: Ego 4/14 PS, 1922 made in Berlin, Germany - Faksta
No 7: Hammel, 1888 made in Copenhagen, Denmark - Joao
No 8: Thomond No2, cca 1929 made in Dublin, Ireland - ftg3plus4
No 9: Bersey Electric Cab, 1897 made in London,England - Joao
No 10: Tzen, 1970 made in Athens, Greece - 75america
No 11: Roa, 1960 made in Madrid, Spain - Joao
No 12: AG Traction Volumax, 1998 made in Lisboa, Portugal- 75america
No 13: Gräf&Stift Voiturette, 1897-1898, made in Wien, Austria - the world's first front-wheel-drive automobile. - Paul Jaray
No 14: Gurik, 1907 made in Stockholm, Sweden - 75america
No 15: Teijo Monika, 1980 made in Finnland - Joao
No 16: Carol Galea Special, made in Malta - Joao
No 17: Douglas TF, 1992 made in Cyprus - guido66 - I don't know the city where it was built, so this is one of the exceptions.
No 18: Victor BMW 328, made in Ljubljana, Slovenia - 75america
No 19: Estonia 2, made in Tallin, Estonia - 75america
No 20:Leutner Rossija, 1899 made in Riga, Russian Empire then, Latvia nowadays - Faksta
No 21: Lada VFTS made in Vilnius, Lithuania - 75america
No 22: Wadera (based on a Fiat 126p which is known as Maluch in Polish) by Metal-Incar. Made in Warsaw, Poland between 1994-1997. Later its production was taken over by a company, called Bartek. - guido66
No 23: 1930 Walter Super 6B made in Praha-Jinonice, Czechoslovakia - Joao
No 24: BAZ MNA 1000 made in Bratislava, Slovakia - Joao and 75america - I have a light heart. Hope you don't mind.
No 25: MĮG Magomobil Postal van, cca 1925 - made in Budapest, Hungary - Joao
No 26: Velizar Andreev's Vilicar, 1990 made in Sofia, Bulgaria - 75america
No 27: Rocar TV12F made in Bucharest, Romania - 75america
Here's the final score
Faksta: 3 points
Ftg3plus4: 2 points
Paul Jaray: 2 points
guido66: 3 points
Joao: 8 points
75america: 10 points