Sebastian's apartment is located near the old-city. It is very convenient place. There are many restaurants and shops within walk-able distance. In addition, it took 5 minute-walk to the nearest subway station where the trains from the airport arrived directly.
The apartment is very clean. It was not so large, but appropriate for one or two person. It has nice kitchen and laundry machines, which are helpful for me while the stay.
Sebastian is a great host. He told me the way to get there in detail. So I could arrive his apartment very easily. I gave me a lot of information of the city. It was also helpful for me.
I strongly recommend this apartment for tourists who are travelling alone or in a couple.