Benjamin is a very friendly and helpful host. Before coming to Lisbon, he answered all my queries very quickly and, once there, we could stay in touch. He was waiting at the meeting point on the day of arrival and gave many tips about what to visit in the city.
The apartment fits the description and the pictures, the location is very convenient to visit the whole city. It is not too small for Alfama and it is well equipped (there's even a washing machine and a dryer so that you can hang your laundry outside to dry). The big kitchen is fully equipped too. The bathroom is quite small but it's ok. The bed is large and comfortable. Be aware that the stairs are very steep and are not practical for handicapped people. The only downside is that you can hear everything around you, especially the TV and/or the radio from the flat below (very early in the morning and late at night - and the noise can't be covered up). But all in all, this is a place I would recommend.