This is an excellent unit for a group of 3 or 4 (maybe even 5) people. There are two separate bedrooms, and two separate floors, so division of the rooms is quite easy. The appliances and all appurtenances are new and very modern, and all work (at least everything we used!).
Obviously, the view is well worth the price and you have a deck from which you can enjoy a "personal" experience with Istanbul and the Strait of Bosporus. It was both cold and rainy during our stay, so outside time was very limited. You are essentially on the 4th an 5th floor of a 5-floor complex, without an elevator, so you'll work a little to get into your unit, and your street is about 3 floors above the main street that runs along the coastline. You are directly across from the main ferry terminal, and the terminus of one of the tram lines, so access is exceptionally easy. You are about a 15-minute hike from Taksim Square, but that's mostly uphill. We always took the funicular (which is literally at the bottom of the stairs going down to the tram terminal, takes about 3 minutes and costs less than a dollar, so not a problem, at all).
The major feature of this unit are the hosts and the personnel which support your stay. They were always on call, met us at two a.m. in the morning of our arrival and again at 4:45 a.m. on the day we departed, simply to make check-in and check-out that much easier. We dealt with Merve and Ede, and they were both very accommodating and extremely pleasant to deal with.
We will definitely go back to Istanbul and most likely would stay in this unit even if there were only two of us in a single bedroom! We highly recommend it.