Murat is a very good host and responsive. Any inquiry I had with him, he responded very fast. This is a very good stay for anyone who is coming to Istanbul for the first time because it is very close to many tourist locations and sightseeings. So anywhere you want to go you could either go on foot or if they are a bit further you can take public transport within 20-30 minutes. (get an Istanbul card)
The flat itself was very clean, the kitchen has the basic cooking appliances, and the shower is very hot. The thermometer can be a bit tricky sometimes so I hope they fix it.
Since it's on the fifth floor without an elevator, going up the stairs for the first time could seem too much, but if you don't have knee/back problems, you get used to it in no time!
There's a carrefour nearby where the prices are better than other groceries. Using your own card might save you more as well than exchanging your cash as the exchange rates in Istanbul are not very good for EUR/GBP.