Petra - you'd be amazed what you can do with just a little space and a few clip-on light fixtures with full-spectrum grow bulbs. I have relatives in the Netherlands who do successfully harvest jalapenos and Beefsteak tomatoes without the aid of a greenhouse. Give it a try next year - start your seeds early indoors, and fertilize the hell out of them (not a hard thing for you to do, just take some of the bullshit you collect at work home...)
Last fall I convinced a local church that has a huge property that the best way for them to witness to their community was to create a community garden. They have amazing soil that I enriched with manure last fall and compost this spring. In addition to the community garden I now have a 40' x 80' plot for myself.
Potatoes, peppers, beans, spinach, watermelon, tomatoes, carrots, lettuce, cantaloupe, and zucchini. As well as a huge herb bed, featuring HUGE amounts of basil. I'm going to mass-produce pesto this fall.
Gardening = good.