Are there any errors in this text?

Hi guys, are there any errors in this postcard? Thank you.

Dear John,
     How (Unless you really mean "what" - English speakers often open letters with "how") are you doing? I'm in London and I'm having a fantastic time here. I arrived three days ago and I'll be staying here for about four days. I'm residing in a college with other students from the rest of Italy. I'll be studying English in London for a week with an English teacher. Her name's Apostolia and she come from Cyprus. She's about thirty years old and she's very nice and funny. She recently explained the English future to us. She'll be accompanying us to visit London City. Then, in the afternoon, we're going into London eye to see the city from above. At 5 o'clock, we're returning to the college. At 6 o'clock, we'll have dinner. In the evening, we usually go out for a trip. Tonight we'll be watching an English film. At the moment, I'm having fish and chips, it's fantastic! And what about you? Did you have dinner?

See you soon.

(Regarding your questions about present continous - you were right on both - no changes - great job!)