Cafe Gundel is a lovely little bakery in Heidelberg, very close to the stairs/funicular to the castle. The first thing you will notice its its dreamy window display! So pretty! I had to stop in!
To order at Cafe Gundel, you simply walk in and order from the small bakery counter. Everyone spoke perfect English. Cafe Gundel serves breads, sandwiches, quiche, and all sorts of desserty goodness. You can pay at the counter and take it to go, or you can sit in the adjoining, table-service dining room (inside only, outside is a different restaurant…don’t make that mistake). If you decide to eat-in, the bakery counter will give you a small ticket that you take to a table of your choice. A waitress will be around shortly to take your drink order, and she will bring your bakery goods with your drink. 
For my visit, I ordered a cappuccino and a fabulous blueberry cake – for breakfast! Oh, vacation! Dan ordered the quiche, and I had to try a bite. It was also very good (although much less exciting).
Craig ordered an interesting sweet for breakfast. He ordered a Heidelberg speciality – a chocolate square with layers of chocolate on the inside and an edible stencil of the castle on the top. YUM! 
What a great spot for a quick, inexpensive meal!