Brilliant location, only around 10-15 walking time to major landmarks. The hosts are lovely and very friendly - we were made to feel very welcome. They have an adorable little cat who isn't afraid to cuddle up to you!
The area felt very safe. The apartments are above a small shop so it's easy to pick up essentials during your stay. I would highly recommend this place as a base for exploring the Old Town of Istanbul.
The only downsides are that the neighbourhood is quite hilly with narrow streets, so probably wouldn't be suitable for young children or the elderly. During weekdays, it got very noisy with the call to prayer (around 6:30am in March). On some nights it was also loud with the sound of dogs barking - luckily we had earplugs so this wasn't a problem. Maybe something to consider bringing if you're a light sleeper.