We booked two rooms for our family of four, and had plenty of room. TC Marko is not hard to find, right on the main road. Being on a main road and hosting a very popular restaurant does make it noisy, we had no trouble sleeping we were exhausted every night due our busy schedule, but this maybe an issue for light sleepers.
All the staff are very friendly and helpful. We booked the half-board option which is a very reasonable rate, we had the set menu which was ample but fairly basic. The restaurant menu is quite extensive so you may wish to book bed and breakfast and choose the wider selection on offer for dinner, these meals did look really tasty.
We were happy with our choice of accommodation and didn't mind the drive to and from Plitvice Lakes National Park. These Lakes are magnificient surpassed all expectations. We caught the shuttle bus to the top of the lakes and took a leisurely six hour walk through the entire National Park, the beauty of how all these lakes link together is really something to see. If you can't spend the whole day there the lower lakes are the more scenic and well worth seeing if you have limited time.

Just returned for one night in Tc Marko and we found the place very quiet and clean.
We have stayed in the appartments far from the restaurant (because of the noise) and the place is quit good.
The food in the restaurant are splendid and cheap.
Is a splendid place for base to Plitvice lakes.

My wife and I stayed just one night here and found the location to be much further away than anticipated. It is a good 15 miles north of Plitvice and we saw many other possibilities that would have been much closer. The hotel itself was spartan with only necessary furniture but with plenty of room. The included breakfast was more than adequate. We stayed in the rear hotel apart from the restaurant building due to their recommendation that these were "the nicer rooms." The rooms seemed to be susceptible to noise but truthfully we were not bothered as we got up early and the hotel was sparsely rented out. It seemed as if the hotel was suited for multiple children families as they had a pool and some animal rides on site.
Plitvice was worth the drive. Go early in the morning so you can have the waterfalls, pools, and trails to yourself. Bring walking shoes and a coat for this time of year.

we did have a small problem, but was sorted. We where put in the rooms about the restaurant, which are quite grotty and noisy, but were moved to the hotel up the hill a bit. These were small, but adequate and comfy, plenty of HOT water, comfortable bed and clean. The restaurant is excellent and great value, don't bother with starters, as portions are very large.

A good base for the lakes, which are a must see, but don't bother with the caves, not worth the money