I haven't met Yusuf, but I met Erol and he has been very helpful. He welcomed us with a tea, and gave us very good food suggestions for the one day that we visited Istanbul. The room design was very nice and it's nicely located within the Sultanahment area close to the Blue Mosque, Aya Sofia, and Topkapi Palace. Please do not visit touristy places around the Sultanahmet area, they are expensive and food quality is poor. Go by the host's suggestion with Ortaklar - it's a very nice place for meat and kebab lovers.