7 years is a long time, you know each other well - there is no reason why you shouldn't go on strong.
Anyway, there are many resources on the internet for ideas of long distance relationships and to keep the spark up.
also, you are 'just' across Europe (ie, not across oceans), so you may be able to find the occasional affordable flight for a weekend, and you know you will have holidays together.
Try sending letters to each other as well as Skype/phoning often (switch things up to prevent a routine from becoming a chore). Sending handmade gifts and letters is also much more personal than merely Skype and will help up.
Also, think that absence makes the heart grow fonder, so you will treasure your encounters for those 2 years, and afterwards you will be permanently together again. Either way, do not fear and have faith - 7 years is a long time, you are both in it for the long run.
For a bit of extra motivation - I know a lovely couple who've been together for 8-9 years, 4 of those years they have spent in an LDR across Europe (and not from the beginning of the relationship). They have regular contact with each other and love each other like the first day.
Add-on - there is also a sticky topic which has advice and support for TSR members in an LDR Relationship - I would recommend checking it out!