Problem with setting up vertical lines in booktabs tables

Question

As pointed out here it is important to use

\multicolumn{3}{|l|}{}

in the following line of multicolumn.

Nevertheless I am struggling around with the same issue (unconnected vertical lines) and can't find a solution for it:

Here is how far I got. Any ideas would be great.

\usepackage{booktabs}
\usepackage{multirow}
\usepackage{makecell}

{\renewcommand{\arraystretch}{2}%
\begin{table}
\centering
\begin{tabular}{@{}ll|cc@{}} \toprule
\multicolumn{2}{c|}{\multirow{2}{*}{}} & \multicolumn{2}{c}{Text} \\
\cmidrule(r){3-4}
\multicolumn{2}{c|}{} & A & B\\ \midrule
\multicolumn{1}{c|}{\multirow{2}{*}{\thead{Text1 and \\ Text2}}} & C & \thead{1\\and 1}& 2 \\
\multicolumn{1}{c|}{} & D & 3 & \thead{4\\ and 4} \\
\bottomrule
\end{tabular}
\end{table}} \quad

Answer 1

Booktabs sets a vertical padding above and below its rules. You can set this padding to 0, and enjoy the other functionalities. Anyway, with \arraystretch set to 2, do you really need it? If necessary, you can replace it with the \setcellgapes command from makecell. I took the opportunity to slightly simplify the code of your table, with the \multirowthead command:

\documentclass{article}
\usepackage{booktabs}
\usepackage{multirow}
\usepackage{makecell}

\begin{document}

\begin{table}
\renewcommand{\arraystretch}{2}%
\centering
\aboverulesep = 0pt
\belowrulesep = 0pt
\begin{tabular}{@{}ll|cc@{}} \toprule
\multicolumn{2}{c|}{\multirow{2}{*}{}} & \multicolumn{2}{c}{Text} \\
\cmidrule(r){3-4}
\multicolumn{2}{c|}{} & A & B\\ \midrule
\multicolumn{1}{c|}{\multirowthead{2}[-1ex]{Text1 and \\ Text2}} & C & \thead{1\\and 1}& 2 \\
\multicolumn{1}{c|}{} & D & 3 & \thead{4\\ and 4} \\
\bottomrule
\end{tabular}
\end{table} \quad

\end{document} 

Answer 2

As mentioned in the booktabs documentation (and with that in the comments above) I tried it without the vertical lines and have to admit that it looks better now:

\documentclass{article}
\usepackage{booktabs}
\usepackage{multirow}
\usepackage{makecell}

\begin{document}    

{\renewcommand{\arraystretch}{2}%
\begin{table}
\centering
\begin{tabular}{@{}ccc@{}}
\toprule
& \multicolumn{2}{c}{Text} \\
\cmidrule(r){2-3}
\thead{Text1 and \\ Text2} & A & B\\
\midrule
C & \thead{1\\and 1}& 2 \\
D & 3 & \thead{4\\ and 4} \\
\bottomrule
\end{tabular}
\end{table}} \quad

\end{document}