I’ve been having Skype lessons with Andrea for one month (3 a week). Lessons can be arranged flexibly during Beijing hours (at the weekend too) and are 50 minutes long. After every session she sets me homework to do to practice what we’ve learned during that lesson. Andrea is an excellent teacher, very friendly and enjoyable to work with. She was very good at firstly assessing my skill level and then pushing me accordingly. The better I get the harder she is pushing me. She is also happy to work on anything specific that is helpful for me living in singapore even if it would not be part of the traditional syllabus at this stage. Andrea and the service generally come highly recommended, I think that it is a good value service that allows very quick progress if you are willing to commit the time to it.