If this flat is busy, check this one - https://www.airbnb.com/rooms/2912694
"The Cave" house is freshly fully renovated in 2017. It is ready to be your home during a stay in Budapest. All essentials are included, such as towels, shampoo, hairdryer, washing machine, microwave etc. Apartment is located in the BEST district of Budapest - VII, between Heroe's Square and Keleti train station. It comfortably accomodates up to 4 people. Please notice that the maximum height in the bathroom is 180 cm.