Martin is a very warm and friendly host. His helpful tips about what to do in Berlin were wonderful. His place is ideally located in a bohemian neighbourhood, close to all public transport (including a great bike rental shop) and great eating out places. Food shopping also easy and Martin makes available space in the frig. Sharing a place with him worked really well, he was companionable yet afforded us privacy. The room was large and airy , bed firm and comfortable, nice touches like plants on the balcony. Easy walk up 3 flights - and bike parking possible in rear courtyard (renting a bike highly recommended as very easy). So a great place, and highly recommended. !!!