I highly recommend staying at Silke's place. The apartment is brand new, clean and very comfortable. We felt like home. The neighbourhood is quiet and close to more turistic areas (15-20 minutes walk to Alfama, Barrio Alto). We're walking most of the time but you have a bus stop just around the corner. Silke was very helpful and always ready to answer all our questions. It's hard to imagine a better place and host!