We stayed at Sebastian's place three nights. Sebastian was very kind to welcome us and to advise all his favourite restaurants and locals. Always punctual.
The appartment is cosy and indeed close to the city center. It is also close to the square with many open locals and it was very noisy at night. If you don't stay late outside, it might be disturbing as it was for us. In other case, it might not be a problem for you.
The bathroom is close to the kitchen of his neighbour and we felt a constant smell of fried food that was not so pleasent.
With small investment Sebastian could renew some of the elements (as bed and hair dryer that is quite old) to make the appartment more comfortable.