@Samia85
I can't comment on the comfort of the furniture but, if you haven't already done so, I would include a mention on your listing (maybe under 'other things to note') that some of the windows do not have curtains and explain why and that other people cannot see in. If that isn't mentioned, then the guest sort of has a valid reason for complaint. On the other hand, it seems pretty obvious from the photos, but guests usually don't notice details like this when looking at the listing. At least if it is mentioned, you have covered yourself.
Whilst it might not bother most guests, some do get funny about this sort of thing. I don't have curtains/blinds on one of my bathroom windows, only privacy film on sections of them. I have reasons why I would prefer not to have them in there and have tested whether anyone can see it and they can't (it's against the laws of physics so a 'sensible' guest would realise this). Still, the occasional guest freaks out about it. Annoying as it is, I feel like I'll just have to cover the rest of the windows with the privacy film.
If you can bear to do it, maybe think about installing some unobtrusive blinds above the windows which don't spoil the view when not in use but provide a sense of privacy for those that want it.
RE the TV, I would take this on board as feedback for improvement. If it is easy enough to do so (you said the guest could have moved it), put it in a more practical place for viewing. Otherwise, if this is the only guest who took issue with it, then perhaps it's not worth it.