Dear ...(имя)
I'm writing to you to tell about my house.Well,I have a big/small house on...(адрес)My house is on... (этаж)It has...(число комнат) rooms:living room,bathroom,my own room и т.д.I like/love/am keen on my house,because it's big/beautiful/comfortable/cosy.I would like invite you to my house!
With,love
Your friend(свое имя)