Deniz houses is a great place to stay if you're travelling on a budget!

Positives: In the city center right next to (2 minutes by foot) the Blue Mosque and all the most beautiful sights. The buffet breakfast on the roof is delicious and has a great view of the city. There is a safe and Tv in the room. Great service at the front desk. They give you free bottles of water and slippers. Your room is cleaned every day.

Negatives: The wifi is painfully slow. I'd bring ear plugs or ask for a room not on the street because sometimes the bar/restaurant plays loud music at night.

Travelling tip: when you're leaving Istanbul to go to the airport, nearby travel agencies can take you by shuttle for 5 euros a person-- this is cheaper than a private shuttle (20-25 euros) or a taxi if there are 1 or 2 of you travelling together.