My pleasure.
I could recommend some stuff, but the information is mostly freely available.
So unless you all have questions for things that are not easy to search for I would recommend 'man the Google'.
Google maps gives a nice overlook over what kind of area the hotel is in.
If you look up information centers they give out all kinds of information about what is interesting to visit in Berlin.
Then if you planned out where you are going, take a look at Google maps again how you need to travel and what kind of transportation can take you their.
Then look up what is the cheapest ticket to get their with said transportation (zones, day ticket, multi day ticket or some other arrangement)
This thread is going a tad of off topic, but that is what I would do if I was going sight seeing in Berlin.