There are three Madal cafés in Budapest. Each one of them is quite central and all of them have wide spaces with good lights for a generally very positive atmosphere. I like sitting outside at the terrace of Madal with friends and study or work together, but for colder days the inside is also perfectly made for concentration.
Madal is a calm spot in the city to get yourself together, get something warm and study in the sunlight or in the quiet rooms of wood. Besides the exceptionally delicious coffee, the bakery products are also of high quality. If you are into specialty coffee, there is a wide variety of coffee beans and tools to buy for creating a similar experience at home.