First of all, I would like to say that this hotel is great value for money! It was our oasis of peace in big noisy city of Istanbul :) In more details
1) Location. Is not perfect, but very good. The closest tourist spot is Grand Bazaar (5-7 min walk uphill), where we usually took tram or metro to get elsewhere. Sultanahmet is more like 30 min walk on the noisy busy streets, so we only went once by foot. Yenikapi metro station(to go to the airport etc) is 20 min walk, also not easy with the luggage, so mind that.
The area close to the Bazaar has plenty of shops, street food, restaurants etc, no problem with that even at night. The hotel street itself is very quiet.
Sea view - is actually a view on the railway and very busy seaside road with heavy traffic :) Didn't mind that as we were exhausted and slept well regardless of anything :) But actually there's no seaside walk possibility etc.
2) The hotel itself is really new! Recently renovated. The interior is super nice. Extreme cleanliness and everything is new and shiny. The room is really very very small, so no big luggage bags :) The shower - is just hanging on the wall in the toilet, so mind that all the bathroom is wet after having a shower.
Terrace on the 2nd floor is nice, but noisy because of the road below. Common kitchen is super, spacious and convenient.
3) Breakfast - costs 15 TL, is traditional Turkish set (vegatables, boiled egg, bread, butter, cheese, ham). Does include instant coffee only, or tea. We asked for Turkish coffee instead, it costs 5 TL. The breakfast is not what can get you going for the whole day or even half, but there's a possibility to order additional dishes from the menu.
4) Staff. I communicated with Can on the website in English, very quick responses and good experience, but we didn't actually meet in the hotel. We were met by another guy (Timur I think) who speaks good Russian. Overall experience was ok, perhaps it would be good to have more additional information, tips, instructions (which you actually need a lot in Istanbul). Timur gave us the Istanbulkart on the first day, which was very important, many thanks for that!!
Thank you for your hospitality!