Podwale 25 Piwna Kompania (http://podwale25.pl)
The restaurant is located near the Old City. Food is typical Polish (similar also to Romanian one), portions are huge and there’s also some live music. Preferably come outside the typical eating hours since the place is crowded you may have to sit in line for lunch but it is all worth it. Mushrooms soup was a delight and the honey ribs are a must try.
You will find Zapiecek easy in the Old City and also on Krakowskie Przedmieście near the Old City. Traditional Polish food. You can get beetroot soup in a cup or in a soup plate if you want to try the version with pierogi. They have a wide variety of pierogi (some kind of dumplings), boiled or fried with different types of stuffing from cabbage, to meat and cherries. The mulled wine is also a must try with more spicy added by the ever present nutmeg. Mind the cue also for Zapiecek around lunch and dinner time.
Green Café Nero (http://www.greencaffenero.pl)
This coffee place is everywhere in central Warsaw near the Old City. It has plenty of room to sit, chill, read a book, surf the internet, or just enjoy a big cup of coffee and some sweets. If you are a coffee fun you can find here also Costa Coffee, Starbucks and some small local coffee places.
Fret a Porter (http://fretaporter.pl)
Freta Street at the end of the Old City is packed with all sorts of restaurants. We stopped in Fret a Porter. We tried the duck with oranges and it was very tasty.
Croque Madame (https://www.facebook.com/CroqueMadame41/)
If you like cakes than this is the place to be. The apple pie and the meringue and chocolate cake are very good.