I loved my stay in "Invictum residence" . location is great, right near taxim square and 3 minute walk to istaklal avenue. Room was clean, nice bed and calm at night.
There was nice breakfast and you can take the breakfast in the room as well.
Oytun met us very well and Caner was very friendly and very helpful to get some information about transportation he even gave us bus card.

The only thing was that they ran out of maps but in general i figured out to navigate without map in Istanbul and one morning was a bit noisy because of construction in front of hotel.
In General I highly recommend this hotel, would go there Again.