Had an amazing, relaxing stay for over one month. Definitely recommended for long-term stays as the neighborhood is really quiet, has a few convenience stores around that are open late into the night, and is walking distance from the main shopping district so you'll have all you need. Galata Tower and Taksim Square are also only about 15 minutes away on foot but it'll take longer to go to the main tourist spots (like the Palace and Blue Mosque) or the Asian side.
The room was kept warm by the heating even during the cold months of November and December. The shower temperature and pressure leaves nothing to be desired! The only thing we were missing was a proper knife in the kitchen. We made do with the smaller "butter knives" to prepare everything.
Wild kudos to the host for being extremely thoughtful and responsive:)