Jose was wonderful. I had a major issue with my luggage on arrival. It was delayed in Paris. I was devastated because I could not contact anyone by phone or arrange the delivery of the luggage. This was due to a lost phone coverage in Berlin. Jose was a major help. He spoke with the airport luggage service in German and assisted in acting as a contact for the delivery.
Jose apartment is deceptively close to everything, especially the main strip of Berlin. The main centre appears to be further than it is. It really is in a good location. You need to make an effort to get out and see how convenient it is by foot and to orient yourself on that first day. Jose is also helpful in pointing out areas for breakfast and food so just ask and your on your way. The U Bahn stop nearby to the apartment provided a good central line. You can connect fairly easily with other lines at Stadmitte. Try it out as soon as possible so you get your bearings and so you can work out how the ticket system works. A day ticket is advisable and ultimately cheaper than single fare.
A word of warning you don't need to try the Chinese because it seems close by. I found it quite greasy. There is a good supermarket next door, but you can try food options a little further on afield. Again these places are not as far as they appear at first.
I had a really nice stay at Jose's place despite my initial dramas. Berlin is quite spread out. The apartment is central to tourist spots, clean, well managed and a secure place to relax in, and of course take in the view.
Thank you Jose for your time and support!